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Over 16% efficiency all-polymer solar cells by sequential deposition

Science China Chemistry 2022年第6期65卷 1157-1163页

作者： Bangbang Li Xuanyu Zhang Ziang Wu Jie Yang Bin Liu Qiaogan Liao Junwei Wang Kui Feng Rui Chen Han Young Woo Fei Ye Li Niu Xugang Guo Huiliang Sun Department of Materials Science and Engineering Southern University of Science and Technology(SUSTech)Shenzhen518055China Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China Department of Electrical and Electronic Engineering Southern University of Science and Technology(SUSTech)Shenzhen518055China Department of Chemistry Korea UniversitySeoul136-713Republic of Korea Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices SUSTechShenzhen518055China

All-polymer solar cells(all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency(PCE) of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition(SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction(BHJ)all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chloronaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted ***, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that(15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs.

关键词： all-polymer solar cells polymer acceptors planar heterojunction sequential deposition

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Intermediate phase assisted sequential deposition of reverse-graded quasi-2D alternating cation perovskites for MA-free perovskite solar cells

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InfoMat 2023年第3期5卷 134-149页

作者： Shaofu Wang Yumin Liu Junjie Zou Junjun Jin Yun Jiang Tao Zeng Wenyan Zhao Rong-Xiang He Bolei Chen Yu Chen Shuoxue Jin Hong-Xiang Li Zhipeng Xie Chang-An Wang Weiwei Sun Qiang Cao Xing-Zhong Zhao School of Materials Science and Engineering National Engineering Research Center for Domestic&Building CeramicsJingdezhen Ceramic UniversityJingdezhenthe People Republic of China School of Physics and Technology Institute of Technological SciencesKey Laboratory of Artificial Micro/Nano StructuresMinistry of EducationWuhan UniversityWuhanthe People Republic of China Institute for Interdisciplinary Research(IIR) Key Laboratory of Optoelectronic Chemical Materials and DevicesMinistry of EducationJianghan UniversityWuhanthe People Republic of China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijingthe People Republic of China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduthe People Republic of China College of Aerospace Science and Engineering National University of Defense TechnologyChangshathe People Republic of China

One-step deposition approaches have been widely applied and developed in the fabrication of quasi-2D ***,the regulation of quantum wells(QWs)and crystalline orientation is difficult and complicated when using this *** deposition is another widespread synthetic approach for preparing perovskite films and perovskite dimension *** this article,δ-CsPbI_(3)intermediate phase assisted sequential(IPAS)deposition is successfully carried out to fabricate MA-free quasi-2D ACI *** amount of theδ-CsPbI_(3)intermediate phase in the PbI2 layer and the concentration of GAI molecule in the IPA solution both play important roles in the production of MA-free quasi-2D ACI perovskite *** n value of the MA-free quasi-2D ACI perovskites can be adjusted,which affects the photovoltaic performance and device *** with one-step deposition,the MA-free quasi-2D ACI perovskites prepared via IPAS deposition have opposite reverse-graded QW distribution and improved vertical orientation,leading to a remarkable PEC of up to 18.86%and allowing the preparation of unpackaged devices with prominent working stability(80%,400 h).The underlying mechanism and crystallization pathway of IPAS deposition confirm that sequential deposition has unique superiority in regulating the QW distribution and crystalline orientation of quasi-2D perovskites.

关键词： intermediate phase quantum well distribution quasi-2D perovskite sequential deposition solar cells

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Optimization of solvent swelling for efficient organic solar cells via sequential deposition

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Materials Reports(Energy) 2021年第4期1卷 77-83页

作者： Qiaogan Liao Bangbang Li Huiliang Sun Chang Woo Koh Xianhe Zhang Bin Liu Han Young Woo Xugang Guo Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPR China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongPR China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001PR China Research Institute for Natural Sciences Department of ChemistryKorea UniversitySeoul 136-713South Korea

Compared to bulk heterojunction(BHJ)organic solar cells(OSCs)prepared by the blend casting in“one step process”,sequential deposition(SD)processed OSCs can realize an ideal profile of vertical component distribution due to the swelling of polymer ***,we did trials on several kinds of second solvents for swelling the polymer layer,and investigated the packing structure and morphology of the swollen films and the performance of the resulting *** found that an optimized morphology can be achieved by solvent swelling while using orthodichlorobenzene(o-DCB)as the second layer processing-solvent,with polymer donor PffBT-3 as bottom layer,PC71BM as top layer and bicontinuous networks in the *** solvent swelling process also makes the SD method exempt from thermal annealing *** device based on SD yields a power conversion effi-ciency(PCE)up to 8.7%without any post-treatment,outperforming those from the devices based on SD using other solvents and that(7.06%)from BHJ device,*** also extended the use of this approach to allpolymer blend system,and successfully improved the efficiency from 4.72%(chloroform)to 9.35%(o-DCB),which is among the highest PCEs in all-polymer-based OSCs fabricated with SD *** results demonstrate that the swelling of the polymer by the second layer solvent is a necessity for SD,paving the way towards additivefree high-performance OSCs.

关键词： Organic solar cells Bulk heterojunction sequential deposition Solvent swelling Vertical phase separation Second solvent

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Enhancement of vertical phase separation in sequentially deposited organic photovoltaics through the independent processing of additives

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Journal of Energy Chemistry 2024年第7期94卷 768-777页

作者： Damin Lee Changwoo Park Gayoung Ham Young Yong Kim Sung-Nam Kwon Junyeong Lee Sungjin Jo Seok-In Na Hyojung Cha Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 41566Republic of Korea Department of Energy Convergence and Climate Change Kyungpook National UniversityDaegu 41566Republic of Korea Pohang Accelerator Laboratory(PAL) Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37673Republic of Korea Department of Flexible and Printable Electronics Jeonbuk National UniversityJeonju-siJeollabuk-do 54896Republic of Korea School of Energy Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

Herein,the impact of the independent control of processing additives on vertical phase separation in sequentially deposited (SD) organic photovoltaics (OPVs) and its subsequent effects on charge carrier kinetics at the electron donor-acceptor interface are *** film morphology exhibits notable variations,significantly depending on the layer to which 1,8-diiodooctane (DIO) was *** incidence wide-angle X-ray scattering analysis reveals distinctly separated donor/acceptor phases and vertical crystallinity details in SD ***-of-flight secondary ion mass spectrometry analysis is employed to obtain component distributions in diverse vertical phase structures of SD films depending on additive *** addition,nanosecond transient absorption spectroscopy shows that DIO control significantly affects the dynamics of separated charges in SD *** SD OPVs,DIO appears to act through distinct mechanisms with minimal restriction,depending on the applied *** study emphasizes the significance of morphological optimization in improving device performance and underscores the importance of independent additive control in the advancement of OPV technology.

关键词： sequential deposition Vertical phase separation Charge dynamics Organic photovoltaics Nonfullerene acceptors

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Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability

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Journal of Semiconductors 2023年第5期44卷 34-41页

作者： Kang An Wenkai Zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Frontiers Science Center for Transformative Molecules Center of Hydrogen Scienceand School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China South China Institute of Collaborative Innovation Dongguan 523808China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering&State Key Laboratory of Pulp&Paper Engineering South China University of TechnologyGuangzhou 510640China

Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs.

关键词： morphology all-polymer solar cells thermal stability sequential deposition

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Performance enhancement in organic solar cells and photodetectors enabled by donor phase optimization at the surface of hole transport layer

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Chinese Chemical Letters 2023年第6期34卷 480-486页

作者： Xiaoyang Du Qian Zhang Zeyu He Hui Lin Gang Yang Zhenhua Chen Caijun Zheng Silu Tao School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Shanghai Synchrotron Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The domain purity,material crystallinity and distribution at the interface between the active layer and the transport layer have an important impact on the performance of organic solar cells(OSCs)and organic photodetectors(OPDs),while this focal issue has received less attention in previous *** this perspective,a new method to simultaneously enhance the performance of OSC and OPD is proposed,namely,using a sequential deposition method to first construct a compact stacking structure of dualdonor(D18-Cl:PTO2)eutectic in the donor layer,and then induce the ordered deposition of the acceptor(Y6).Compared with the conventional bulk heterojunction(BHJ),the active layer realized by this method not only improves the crystallinity and stacking order of the constituent material on the surface of the transport layer,but also regulates a good vertical distribution,which is conducive to improving the charge transport and extraction efficiency,reducing the leakage current,and enhancing the stability of the *** a result,the OSC device based on the D18-Cl:PTO2/Y6 structure achieves a power conversion efficiency of up to 17.65%and good light-degradation stability,which is much better than that of BHJbased OSC(PCE of 16.37%).For the OPD,the dark current at reverse bias is reduced by more than an order of magnitude,and the maximum responsivity is improved to 0.52 A/W through the optimization of the donor phase at the ***,the strategy does not require additional post-processing compared to the BHJ preparation,which reduces the device construction cost and process complexity,providing an effective way for developing high-performance organic optoelectronic devices.

关键词： Organic solar cells Organic photodetectors sequential deposition Vertical distribution Bulk-heterojunction

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顺序沉积法制备的有机太阳能电池的电压损失研究（英文）

顺序沉积法制备的有机太阳能电池的电压损失研究（英文）

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第九届新型太阳能材料科学与技术学术研讨会

作者：康慧张渊化学学院黑格尔北京研究院北京航空航天大学

With nearly 100% yields for mobile charge carriers in organic solar cells(OSCs), the relatively large photovoltage loss(ΔVoc) is a critical barrier limiting power conversion efficiency of OSCs. Herein, we present a study based on sequential film deposition(SD) to improve the open-circuit voltage(Voc) in OSCs with non-fullerene acceptors. We show that ΔVoc in the planar heterojunction(PHJ) devices prepared by SD method can be appreciably mitigated, leading enlargements of Voc up to 80 mV with regard to Voc of according bulk heterojunction(BHJ) devices. In the PHJ OSCs, energetic level of intermolecular chargetransfer states is found to increase associated with the decrease of aggregations in solid states. These properties explain enhanced electroluminescent quantum efficiency(EQEEL) and resultant suppression on the voltage losses induced by non-radiative charge recombination and interfacial charge transfer. This work provides a promising strategy in tacking with the heavily discussed photovoltage loss in OSCs.

关键词： sequential deposition organic solar cell photovoltage loss

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