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Controllable Photoelectric Properties of Carbon Dots and Their Application in Organic Solar Cells

Chinese Journal of Polymer Science 2022年第1期40卷 7-20页

作者： Wen-Sheng Zhao Xin-Xin Li Han Zha Yong-Zhen Yang Ling-Peng Yan Qun Luo Xu-Guang Liu Hua Wang Chang-Qi Ma Bing-She Xu Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Printed Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences(CAS)Suzhou 215123China Ministry of Education and College of Textile Engineering Taiyuan University of TechnologyJinzhong 030600China

Organic solar cells are a current research hotspot in the energy field because of their advantages of lightness,translucency,roll to roll printing and building integration.With the rapid development of small molecule acceptor materials with high-performance,the efficiency of organic solar cells has been greatly improved.Further improving the device efficiency and stability and reducing the cost of active layer materials will contribute to the industrial development of organic solar cells.As a novel type of carbon nanomaterials,carbon dots gradually show great application potential in the field of organic solar cells due to their advantages of low preparation cost,non-toxicity and excellent photoelectric performance.Firstly,the synthesis and classification of carbon dots are briefly introduced.Secondly,the photoelectric properties of carbon dots and their adjusting,including adjustable surface energy level structure,good film-forming performance and up/down conversion characteristics are summarized.Thirdly,based on these intrinsic properties,the feasibility and advantages of carbon dots used in organic solar cells are discussed.Fourthly,the application progress of carbon dots in the active layer,hole transport layer,electron transport layer,interface modification layer and down-conversion materials of organic solar cells is also reviewed.Finally,the application progress of carbon dots in organic solar cells is prospected.Several further research directions,including in-depth exploration of the controllable preparation of carbon dots and their application in the fields of interface layer and up/down conversion for improving efficiency and stability of device are pointed out.

关键词： Organic solar cells Carbon dots Interface layer power conversion efficiency Stability

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Non-Fullerene-Based Inverted Organic Photovoltaic Device with Long-Term Stability

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Energy & Environmental Materials 2023年第3期6卷 214-221页

作者： Do Hui Kim Febrian T.A.Wibowo Dongchan Lee Narra V.Krishna Sujung Park Shinuk Cho Sung-Yeon Jang Department of Physics and Energy Harvest Storage Research Center University of UlsanUlsan 44610Republic of Korea School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)50 UNIST-gilUlsan 44919Republic of Korea

In this work,we developed the PM6:Y6-based inverted structure organic photovoltaic(i-OPV)with improved power conversion efficiency(PCE)and long-term stability by resolving the origins of the performance deterioration.The deep defects between the metal oxide-based electron transport layer and bulk-heterojunction photoactive layer interface were responsible for suboptimal PCE and facilitated degradation of devices.While the density of deep traps is increased during the storage of i-OPV,the penetrative oxygen-containing defects additionally generated shallow traps below the band-edge of Y6,causing an additional loss in the open-circuit voltage.The suppression of interfacial defects by chemical modification effectively improved the PCE and long-term stability of i-OPV.The modified i-OPV(mi-OPV)achieved a PCE of 17.42%,which is the highest value among the reported PM6:Y6-based i-OPV devices.Moreover,long-term stability was significantly improved:~90%and~80%retention of its initial PCE after 1200 h of air storage and illumination,respectively.

关键词： deep trap inverted structure long-term stability organic photovoltaic power conversion efficiency

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Review of current progress in hole-transporting materials for perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 330-386页

作者： Prerna Mahajan Bhavya Padha Sonali Verma Vinay Gupta Ram Datt Wing Chung Tsoi Soumitra Satapathi Sandeep Arya Department of Physics University of JammuJammuJammu and Kashmir 180006India Department of Physics Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates SPECIFIC College of EngineeringSwansea University Bay CampusFabian WaySA18ENSwanseaUnited Kingdom Department of Physics Indian Institute of Technology RoorkeeUttarakhand 247667India

Recent advancements in perovskites’ application as a solar energy harvester have been astonishing. The power conversion efficiency(PCE) of perovskite solar cells(PSCs) is currently reaching parity(>25 percent), an accomplishment attained over past decades. PSCs are seen as perovskites sandwiched between an electron transporting material(ETM) and a hole transporting material(HTM). As a primary component of PSCs, HTM has been shown to have a considerable effect on solar energy harvesting, carrier extraction and transport, crystallization of perovskite, stability, and price. In PSCs, it is still necessary to use a HTM.While perovskites are capable of conducting holes, they are present in trace amounts, necessitating the use of an HTM layer for efficient charge extraction. In this review, we provide an understanding of the significant forms of HTM accessible(inorganic, polymeric and small molecule-based HTMs), to motivate further research and development of such materials. The identification of additional criteria suggests a significant challenge to high stability and affordability in PSC.

关键词： Hole transporting material Perovskite solar cells power conversion efficiency Stability

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Machine learning enables intelligent screening of interface materials towards minimizing voltage losses for p-i-n type perovskite solar cells

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能源化学:英文版 2023年第8期83卷 128-137,I0005页

作者： Wu Liu Ning Meng Xiaomin Huo Yao Lu Yu Zhang Xiaofeng Huang Zhenqun Liang Suling Zhao Bo Qiao Zhiqin Liang Zheng Xu Dandan Song Key Laboratory of Luminescence and Optical Information Beijing Jiaotong UniversityMinistry of EducationBeijing 00044China Institute of Optoelectronics Technology Beijing Jiaotong UniversityBeijing 100044China

Interface engineering is proved to be the most important strategy to push the device performance of the perovskite solar cell(PSC) to its limit, and numerous works have been conducted to screen efficient materials. Here, on the basis of the previous studies, we employ machine learning to map the relationship between the interface material and the device performance, leading to intelligently screening interface materials towards minimizing voltage losses in p-i-n type PSCs. To enhance the explainability of the machine learning models, molecular descriptors are used to represent the materials. Furthermore,experimental analysis with different characterization methods and device simulation based on the drift-diffusion physical model are conducted to get physical insights and validate the machine learning models. Accordingly, 3-thiophene ethylamine hydrochloride(Th EACl) is screened as an example, which enables remarkable improvements in VOCand PCE of the PSCs. Our work reveals the critical role of datadriven analysis in the high throughput screening of interface materials, which will significantly accelerate the exploration of new materials for high-efficiency PSCs.

关键词： Perovskite solar cells Machine learning Interface materials power conversion efficiency

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Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells

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Chinese Journal of Polymer Science 2023年第7期41卷 1018-1026页

作者： Peng Wang Yu-Hang Zhu Hong-Xin Tao Yun-Long Ma Dong-Dong Cai Qi-Sheng Tu Ruo-Chuan Liao Qing-Dong Zheng State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China State Key Laboratory of Coordination Chemistry College of Engineering and Applied SciencesNanjing UniversityNanjing210023China

One important subject in the field of all-polymer solar cells (all-PSCs) is the exploration of electron-deficient building blocks with optimized physicochemical properties to promote the performance of polymer acceptors. Here, two ladder-type heteroheptacene-containing small-molecule acceptors with branched 2-octyldodecyl or 2-hexyldecyl side-chains are synthesized and polymerized with the thiophene co-monomer to afford polymer acceptors (PW-OD and PW-HD) with strong near-infrared absorption. Experimental results reveal that the alkyl chain length has a large impact on the molecular packing behavior of the resulting polymers, which in turn affects their light-absorbing and charge transport properties, and thus the photovoltaic performance of the final devices. When blended with the polymer donor PM6, PW-HD-based all-PSCs deliver a higher power conversion efficiency (PCE) of 9.12% compared to the PCE of 6.47% for the PW-OD-based all-PSCs, mainly due to its more ordered inter-chain packing and more favorable blend morphology. This work provides a promising building block for the development of high-performance narrow-bandgap polymer acceptors and highlights the importance of side-chain substitution in optimizing the photovoltaic performance of polymer acceptors.

关键词： All-polymer solar cells Polymer acceptors Ladder-type heteroheptacene power conversion efficiency

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Applications and functions of rare-earth ions in perovskite solar cells

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Chinese Physics B 2022年第3期31卷 36-51页

作者：苍利民钱宗耀王金培陈利豹万志刚杨柯张辉陈永华 Research Center Ancai Hi-Tech Co.Ltd.Anyang 455000China Key Laboratory of Flexible Electronics Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211800China

The emerging perovskite solar cells have been recognized as one of the most promising new-generation photovoltaic technologies owing to their potential of high efficiency and low production cost. However, the current perovskite solar cells suffer from some obstacles such as non-radiative charge recombination, mismatched absorption, light induced degradation for the further improvement of the power conversion efficiency and operational stability towards practical application. The rare-earth elements have been recently employed to effectively overcome these drawbacks according to their unique photophysical properties. Herein, the recent progress of the application of rare-earth ions and their functions in perovskite solar cells were systematically reviewed. As it was revealed that the rare-earth ions can be coupled with both charge transport metal oxides and photosensitive perovskites to regulate the thin film formation, and the rare-earth ions are embedded either substitutionally into the crystal lattices to adjust the optoelectronic properties and phase structure, or interstitially at grain boundaries and surface for effective defect passivation. In addition, the reversible oxidation and reduction potential of rare-earth ions can prevent the reduction and oxidation of the targeted materials. Moreover, owing to the presence of numerous energetic transition orbits, the rare-earth elements can convert low-energy infrared photons or high-energy ultraviolet photons into perovskite responsive visible light, to extend spectral response range and avoid high-energy light damage. Therefore, the incorporation of rare-earth elements into the perovskite solar cells have demonstrated promising potentials to simultaneously boost the device efficiency and stability.

关键词： perovskite solar cells rare-earth ions power conversion efficiency

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Tandem organic solar cells with efficiency over 19% via the careful subcell design and optimization

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Science China Chemistry 2023年第3期66卷 808-815页

作者： Lingxian Meng Huazhe Liang Guangkun Song Mingpeng Li Yuzhong Huang Changzun Jiang Kai Zhang Fei Huang Zhaoyang Yao Chenxi Li Xiangjian Wan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

The series-connected tandem device strategy is an effective approach to promote the efficiency of organic solar cells(OSCs) with broadened absorption range and alleviated thermalization and transmission loss.In this article,two nonfullerene acceptors,FB rThCl and BTP-4Se,with complementary absorptions covering the range from 300 to 1,000 nm were designed and synthesized for the front and rear cell,respectively.The front cell based on D18:FBr-ThCl exhibited a Voc of 1.053 V with high external quantum efficiency(EQE) response values ranging from 300 to 740 nm.The rear cell with a ternary active layer PM6:BTP-4 Se:F-2F was optimized and afforded the Voc of 0.840 V and Jsc of 26.88 mA cm^(-2).Subsequently,the tandem device was constructed with a fully solution-processed interconnected layer of ZnO/PEDOT:PS S/PMA,and demonstrated a power conversion efficiency(PCE) of 19.55% with a Voc of 1.880 V,a Jsc of 13.25 mA cm^(-2) and an FF of 78.47%.

关键词： tandem device organic solar cells front cell rear cell power conversion efficiency

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Predicting the device performance of the perovskite solar cells from the experimental parameters through machine learning of existing experimental results

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Journal of Energy Chemistry 2023年第2期77卷 200-208,I0006页

作者： Yao Lu Dong Wei Wu Liu Juan Meng Xiaomin Huo Yu Zhang Zhiqin Liang Bo Qiao Suling Zhao Dandan Song Zheng Xu Key Laboratory of Luminescence and Optical Information Beijing Jiaotong UniversityMinistry of EducationBeijing 100044China Institute of Optoelectronics Technology Beijing Jiaotong UniversityBeijing 100044China College of Physics and Energy Fujian Normal UniversityFuzhou 350117FujianChina

The performance of the metal halide perovskite solar cells(PSCs)highly relies on the experimental parameters,including the fabrication processes and the compositions of the perovskites;tremendous experimental work has been done to optimize these factors.However,predicting the device performance of the PSCs from the fabrication parameters before experiments is still challenging.Herein,we bridge this gap by machine learning(ML)based on a dataset including 1072 devices from peer-reviewed publications.The optimized ML model accurately predicts the PCE from the experimental parameters with a root mean square error of 1.28%and a Pearson coefficientr of 0.768.Moreover,the factors governing the device performance are ranked by shapley additive explanations(SHAP),among which,A-site cation is crucial to getting highly efficient PSCs.Experiments and density functional theory calculations are employed to validate and help explain the predicting results by the ML model.Our work reveals the feasibility of ML in predicting the device performance from the experimental parameters before experiments,which enables the reverse experimental design toward highly efficient PSCs.

关键词： Machine learning Feature engineering Perovskite solar cells power conversion efficiency

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Self-assembled TiO_(2)hole-blocking layers for efficient perovskite solar cells

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1280-1285页

作者： Zhongbao Que Liang Chu Shuaibo Zhai Yifei Feng Chen Chen Wei Liu Ruiyuan Hu Jing Hu Xing’ao Li New Energy Technology Engineering Laboratory of Jiangsu Province&School of Science&School of Materials Science and Engineering&School of Electronic and Optic Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China

The self-assembly process for compatible functional layers of devices is a simple,feasible,and energy-saving strategy.In mesoporous perovskite solar cells(PSCs),compact and scaffold TiO_(2) films generally function as the hole-blocking and electron-transporting layers,respectively.However,both of these layers are usually generated through a high-temperature annealing process.Here,we deposited TiO_(2) compact films through a room-temperature self-assembly process as effective hole-blocking layers for PSCs.The thickness of TiO_(2) compact films can be easily controlled by the deposition time.Through the optimization of TiO_(2) compact films(80 nm),the power conversion efficiency(PCE)of mesoporous PSCs without and with hole conductor layers increases up to 10.66%and 17.95%,respectively.Notably,an all-low-temperature planar PSC with the self-assembled TiO_(2) layer exhibits a PCE of 16.41%.

关键词： perovskite solar cells titanium dioxide self-assembly power conversion efficiency

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Recent progress in organic solar cells(PartⅠmaterial science)

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Science China Chemistry 2022年第2期65卷 224-268页

作者： Yahui Liu Bowen Liu Chang-Qi Ma Fei Huang Guitao Feng Hongzheng Chen Jianhui Hou Lingpeng Yan Qingya Wei Qun Luo Qinye Bao Wei Ma Wei Liu Weiwei Li Xiangjian Wan Xiaotian Hu Yanchun Han Yaowen Li Yinhua Zhou Yingping Zou Yiwang Chen Yongfang Li Yongsheng Chen Zheng Tang Zhicheng Hu Zhi-Guo Zhang Zhishan Bo College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory and Institute of Elemento-Organic Chemistry Key Laboratory of Functional Polymer MaterialsCollege of ChemistryNankai UniversityTianjin 300071China College of Chemistry/Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Material

During past several years,the photovoltaic performances of organic solar cells(OSCs)have achieved rapid progress with power conversion efficiencies(PCEs)over 18%,demonstrating a great practical application prospect.The development of material science including conjugated polymer donors,oligomer-like organic molecule donors,fused and nonfused ring acceptors,polymer acceptors,single-component organic solar cells and water/alcohol soluble interface materials are the key research topics in OSC field.Herein,the recent progress of these aspects is systematically summarized.Meanwhile,the current problems and future development are also discussed.

关键词： organic solar cells power conversion efficiency photovoltaic materials polymer solar cells

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