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Journal of Energy Chemistry 2024年第8期95卷 357-363,I0008页

作者： Minghao Xia Ziwei Zheng Yanjie Cheng Chaoyang Wang Zhaozhen Cui Guodong Zhang Jinwei Gonga Anyi Mei Hongwei Han michael grätzel center for mesoscopic solar cells Wuhan National Laboratory for OptoelectronicsKey Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074HubeiChina Key Laboratory of Flexible Electronics(KLoFE)&Institute of Advanced Materials(IAM) School of Flexible Electronics(Future Technologies)Nanjing Tech University(NanjingTech)Nanjing 211816JiangsuChina

The low-cost and easy large-scale fabrication advantages of printable mesoscopic perovskite solar cells(p-MPSCs)are overshadowed by their limited photovoltaic conversion efficiency(PCE).Here,we introduce the hydrazide derivative of 4-Hydroxybenzoylhydrazine(4-HBH)to improve the PCE of p-MPSCs by inducing enhanced defect *** carbonyl and hydrazine groups in hydrazide groups present strong interaction with *** hydroxyl group,as an electron donor group,increases the electron cloud density of the hydrazide group in 4-HBH under the conjugation of the benzene ring,and thus enhances its interaction with ***,the hydroxy group itself interacts with perovskite and passivates defects *** hydrazine agents can also reduce I2and suppress the loss of iodine in perovskite films,which inhibits the formation of iodine-related ***,p-MPSCs with 4-HBH achieve a high PCE of 19.21%,and present well improved stability.

关键词： Printable mesoscopic perovskite solar cells Multifunctional hydrazine derivatives Cooperative coordination Conjugation redox activity

Unveiling the effect of amino acids on the crystallization pathways of methylammonium lead iodide perovskites

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Journal of Energy Chemistry 2022年第6期31卷 253-260,I0008页

作者： Wenhao Zhang Jiankang Du Weihua Zhang Yanmeng Chu Anyi Mei Yaoguang Rong Xinyu Gao Hongwei Han Yue Hu michael grätzel center for mesoscopic solar cells Wuhan National Laboratory for OptoelectronicsKey Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074HubeiChina Shanghai Synchrotron Radiation Facility(SSRF) Chinese Academy of SciencesShanghai 201204China

Multifunctional additives are widely used to improve crystallization and to passivate defects in perovskite solar cells. The roles of these additives are usually related to the various functional groups contained in such additives. Here, we introduce a serious of analogues of amino acids into methylammonium lead iodide perovskites and find they play different roles in the crystallization process despite the fact that these additives share exactly the same terminal groups, namely one amino group and one carboxyl group. The corresponding crystallization pathways are established for the first time via monitoring the time-resolved phase formation and transformation. We find that avoiding the rapid formation of perovskites from precursor solution can facilitate the uniform nucleation and growth of perovskite crystals with enhanced crystallinity and reduced defects. Further, we find the different crystallization behaviors probably arise from the inherent structural characteristic of these additives, leading to different interactions in the precursors. This study unveils the effects of amino acids on the liquid–solid crystallization process and helps better understand the role of multifunctional additives beyond their functional groups.

关键词： Perovskite solar cells Multifunctional additives Amino acids Crystallization process

Tartaric acid additive to enhance perovskite multiple preferential orientations for high-performance solar cells

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Journal of Energy Chemistry 2022年第6期31卷 406-413,I0011页

作者： Zhen Wang Shuai You Guanhaojie Zheng Zengguang Tang Liujiang Zhang Junhan Zhang Xiong Li Xingyu Gao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China michael grätzel center for mesoscopic solar cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Perovskite film quality is a decisive factor governing the performance and long-term stability of perovskite solar cells(PSCs). To passivate defects for high-quality perovskite films, various additives have been explored in perovskite precursor with notable achievements in the development of highperformance PSCs. Herein, tartaric acid(TA) was applied as additive in perovskite precursor solution to modulate the crystal growth leading to high quality thin films with enhanced multiple preferential orientations favoring efficient charge transport along multiple directions. It is also noticed that TA can improve the energy level alignment in PSCs, which effectively accelerates both carrier extraction and transportation with non-radiative recombination suppressed at the perovskite interfaces. Based on the present perovskite films, the fabricated PSCs achieved an excellent champion power conversion efficiency(PCE) of 21.82% from that of 19.70% for the control device without TA additive. In addition, a PSC with TA additive was shown to exhibit impressive operational stability by retaining 92% of its initial PCE after~1200 h of aging at room temperature in ambient air with a relative humidity of about 10%–25%. In summary, the present work demonstrates a facile and versatile approach by using TA as additive in perovskite precursor to fabricate high quality perovskite films with enhanced multiple preferential orientations for high-efficiency stable PSCs.

关键词： Perovskite solar cell Multiple preferential orientations Energy level alignment Tartaric acid

High efficiency monobasal solid-state dye-sensitized solar cell with mesoporous TiO2 beads as photoanode

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Frontiers of Optoelectronics 2013年第4期6卷 413-417页

作者： Heng WANG Peng XIANG Mi XU Guanghui LIU Xiong LI Zhiliang KU Yaoguang RONG Linfeng LIU Min HU Ying YANG Hongwei HAN michael gr~itzel center for mesoscopic solar cells Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

A monobasal solid-state dye-sensitized solar cell （ssDSC） with mesoporous TiO2 beads was developed and an efficiency of 4% was achieved under air mass （AM） 1.5 illumination. Scattering properties and electron diffu- sion coefficients ofTiO2 mesoporous beads and P25 nano- particles were investigated. The results show that TiO2 mesoporous beads display higher scatterance than P25 nano-particles, and TiO2 mesoporous beads have higher electron diffusion coefficients （2.86 × 10 5 cm^2·s^-1） than P25 nano-particles （2.26 × 10 5 cm^2·s^-1）.

关键词： dye-sensitized solar cells (DSCs) mesoporousbeads scattering electron diffusion coefficients

SiO2 nanoparticle-regulated crystallization of lead halide perovskite and improved efficiency of carbon-electrode-based low-temperature planar perovskite solar cells

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Chinese Physics B 2020年第7期29卷 576-582页

作者：梁泽荣杨兵初梅安意林思远韩宏伟袁永波谢海鹏高永立周聪华 Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China michael grä tzel Center for Mesoscopic Solar CellsWuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Department of Physics and Astronomy University of RochesterRochesterNY 14627USA

SiO2 nanoparticles were used to regulate the crystallizing process of lead halide perovskite films prepared by the sequential deposition method,which was used in the low-temperature-processed,carbon-electrode-basing,hole-conductor-free planar perovskite solar *** was observed that,after adding small amount of SiO2 precursor(1 vol%)into the lead iodide solution,performance parameters of open-circuit voltage,short-circuit current and fill factor were all upgraded,which helped to increase the power conversion efficiency(reverse scan)from 11.44(±1.83)%(optimized at 12.42%)to 14.01(±2.14)%(optimized at 15.28%,AM 1.5G,100 mW/cm^2).Transient photocurrent decay curve measurements showed that,after the incorporation of SiO2 nanoparticles,charge extraction was accelerated,while transient photovoltage decay and dark current curve tests both showed that recombination was *** improvement is due to the improved crystallinity of the perovskite film.X-ray diffraction and scanning electron microscopy studies observed that,with incorporation of amorphous SiO2 nanoparticles,smaller crystallites were obtained in lead iodide films,while larger crystallites were achieved in the final perovskite *** study implies that amorphous SiO2 nanoparticles could regulate the coarsening process of the perovskite film,which provides an effective method in obtaining high quality perovskite film.

关键词： perovskite solar cell carbon-electrode crystallization low temperature SiO2 lead iodide

Stability improvement under high efficiency—next stage development of perovskite solar cells

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Science China Chemistry 2019年第6期62卷 684-707页

作者： Danni Yu Yue Hu Jiangjian Shi Haoying Tang Wenhao Zhang Qingbo Meng Hongwei Han Zhijun Ning He Tian School of Physical Science and Technology Shanghai Tech University michael gr?tzel center for mesoscopic solar cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Institute of PhysicsChinese Academy of Sciences Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology

With efficiency of perovskite solar cells(PSCs) overpassing 23%, to realize their commercialization, the biggest challenge now is to boost the stability to the same level as conventional solar cells. Thus, tremendous effort has been directed over the past few years toward improving the stability of these cells. Various methods were used to improve the stability of bulk perovskites,including compositional engineering, interface adjustment, dimensional manipulation, crystal engineering, and grain boundary decoration. Diverse device configurations, carrier transporting layers, and counter electrodes are investigated. To compare the stability of PSCs and clarify the degradation mechanism, diverse characterization methods were developed. Overall stability of PSCs has become one central topic for the development of PSCs. In this review, we summarize the state-of-the-art progress on the improvement of device stability and discuss the directions for future research, hoping it provides an overview of the current status of the research on the stability of PSCs and guidelines for future research.

关键词： stability perovskite solar cell photoelectric device

Guanidinium enhanced the open-circuit voltage in hole-conductor-free mesoscopic perovskite solar cells

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Guanidinium enhanced the open-circuit voltage in hole-conduc...

n型金属氧化物电子传输层在介观钙钛矿太阳能电池中的研究（英文）

第三届新型太阳能电池学术研讨会

作者： Xiaomeng Hou Yaoguang Rong Huawei Liu Yanjun Guan Hongwei Han michael gr?tzel center for mesoscopic solar cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology

Since Miyasaka1 first reported perovskite absorber used for photovoltaic applications,the power conversion efficiency of perovskite solar cells(PSCs) has rocked to certified 22.1%(certified) in just five years,which makes PSCs a serious contenders to rival the leading photovoltaic *** has been a crucial challenge to enhance the open circuit voltage for approaching the theoretical limit of the power conversion efficiency,especially for our printable mesoscopic perovskite solar cells based on carbon counter ***,we fabricated the PSC in our triple layer(TiO2/ZrO2/C) device via one-step dropping method,employed a low-cost additive of Guanidinium chloride(Gu Cl).It was found that the open-circuit voltage(Voc) were significantly enhanced to1.02 V,Electrochemical impedance spectra(EIS) analysis indicated that the introduce of the Gu Cl can suppressed charge recombination for the *** standard air mass 1.5 solar conditions,a power conversion efficiency(PCE) of 11.41% was achieved with the printable mesoscopic perovskite solar cells,which offered a wide prospect for low-cost photovoltaics.

关键词： Guanidinium chloride hole-conductor-free printable perovskite solar cells

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Science China Materials 2016年第9期59卷 757-768页

作者：熊玉立刘通发蒋西西荣耀光韩宏伟 michael grätzel center formesoscopic solar cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Yunnan Key Laboratory for Micro/Nano Materials&Technology School of Materials Science and EngineeringYunnan UniversityKunming 650091China

为了满足日益增长的世界能源需要,有机-无机卤化物材料制备的钙钛矿太阳能电池因成本低廉和转换效率高,受到光电材料研究学术领域的高度重视.其获得公证的光电转换效率在短时间内由2009年的3.8%提高到2016年的22.1%.n型电子传输层,作为... 详细信息

为了满足日益增长的世界能源需要,有机-无机卤化物材料制备的钙钛矿太阳能电池因成本低廉和转换效率高,受到光电材料研究学术领域的高度重视.其获得公证的光电转换效率在短时间内由2009年的3.8%提高到2016年的22.1%.n型电子传输层,作为介观钙钛矿太阳能电池的重要组成部分,不仅作为钙钛矿晶体生长的骨架层,还为钙钛矿的激发电子注入提高传输通道.因此,本文简要评述了介观钙钛矿太阳能电池的最新进展,重点介绍了n型金属氧化物电子传输层在介观钙钛矿太阳能电池中的研究近况,主要包括:骨架的材料,骨架的形貌以及骨架同钙钛矿材料层的界面,同时还探讨了这些n型金属氧化物电子传输层的改性和修饰对介观钙钛矿太阳能电池性能的影响.

关键词： n-type electron transport materials mesoscopic perovskite solar cells electron transport scaffold nanostructure

Suppressed recombination for monolithic inorganic perovskite/silicon tandem solar cells with an approximate efficiency of 23%

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eScience 2022年第3期2卷 339-346页

作者： Sanlong Wang Pengyang Wang Bingbing Chen Renjie Li Ningyu Ren Yucheng Li Biao Shi Qian Huang Ying Zhao michael grätzel Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Conversion CenterNankai UniversityTianjin300350PR China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin300350PR China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192PR China Engineering Research center of Thin Film Photoelectronic Technology of Ministry of Education Tianjin300350PR China Collaborative Innovation center of Chemical Science and Engineering(Tianjin) Tianjin300072PR China Laboratory of Photonics and Interfaces Ecole Polytechnique Federale de LausanneLausanne1015Switzerland

Potentially temperature-resistant inorganic perovskite/silicon tandem solar cells(TSCs)are promising devices for boosting efficiency past the single-junction silicon ***,undesirable non-radiative recombination generally leads to a significant voltage ***,we introduce an effective strategy using nickel iodide,an inorganic halide salt,to passivate iodine vacancies and suppress non-radiative ***_(2)-treated CsPbI_(3-x)Br_(x) inor-ganic perovskite solar cells with a 1.80 eV bandgap exhibited an efficiency of 19.53%and a voltage of 1.36 V,corresponding to a voltage deficit of 0.44 ***,the treated device demonstrated excellent operational stability,maintaining 95.7%of its initial efficiency after maximum power point tracking for 300 h under continuous illumination in a N_(2) *** combining this inorganic perovskite top cell with a narrower bandgap silicon bottom cell,we for the first time achieved monolithic inorganic perovskite/silicon TSCs,which exhibited an effi-ciency of 22.95%with an open-circuit voltage of 2.04 *** work provides a promising strategy for using inorganic passivation materials to achieve efficient and stable solar cells.

关键词： Inorganic perovskite Tandem solar cell Recombination Surface passivation

Double Layer Composite Electrode Strategy for Efficient Perovskite solar cells with Excellent Reverse-Bias Stability

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Nano-Micro Letters 2023年第1期15卷 225-235页

作者： Chaofan Jiang Junjie Zhou Hang Li Liguo Tan Minghao Li Wolfgang Tress Liming Ding michael grätzel Chenyi Yi State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China Institute of Computational Physics(ICP) ZHAW School of EngineeringWildbachstr.218400 WinterthurSwitzerland center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China Laboratory of Photonics and Interfaces Department of Chemistry and Chemical EngineeringSwiss Federal Institute of Technology Lausanne1015 LausanneSwitzerland

Perovskite solar cells(PSCs)have become the represent-atives of next generation of photovoltaics;nevertheless,their stability is insufficient for large scale deployment,particularly the reverse bias ***,we propose a transparent conducting oxide(TCO)and low-cost metal composite electrode to improve the stability of PSCs without sacrificing the *** TCO can block ion migrations and chemical reactions between the metal and perovskite,while the metal greatly enhances the conductivity of the composite *** a result,composite electrode-PSCs achieved a power conversion efficiency(PCE)of 23.7%(certified 23.2%)and exhibited excellent stability,maintaining 95%of the initial PCE when applying a reverse bias of 4.0 V for 60 s and over 92%of the initial PCE after 1000 h continuous light *** composite electrode strategy can be extended to different combinations of TCOs and *** opens a new avenue for improving the stability of PSCs.

关键词： Composite electrode Perovskite solar cells Stability Reverse bias Characterization