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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： Xiangxiang Feng Biao Liu Yongyi Peng Chuanjia Tong Junliang Yang School of Physics and Electronics Central South University

Recent experiments demonstrated that the passivation surface via forming strong chemical bond could effectively improve the light stability of perovskite solar cells.[1-3] But, the underlying reasons are not clear. Herein, the elusive underlying mechanisms of light stability enhancement are explained in details using the first principles calculations. The small polaron model and self-trapped exciton model demonstrate that iodine vacancy defect on the surface of perovskite could trap a free electron in the presence of light illumination. The trapped electron occupying the iodine vacancy led to a significant rearrangement of the Pb-I lattice, creating a new chemical species, i.e., a Pb-Pb dimer bound in the typical perovskite of CHNHPbI. The Pb-Pb dimer distorts the Pb-I octahedral lattice and reduce the defect formation energy of the I atoms. The surface Pb site passivation can prevent the formation of the Pb-Pb dimer, thereby improving the light stability. In addition, the strong ionic bond could better stabilize the Pb site.[4]

关键词： Perovskite Pb-Pb dimer passivation iodine vacancy light stability

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Improving intrinsic stability for perovskite/silicon tandem solar cells

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 85-105页

作者： Tailai Xu Yihua Chen Qi Chen School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Monolithic hybrid halide perovskite/crystalline silicon(c-Si)tandem solar cells have demonstrated their great potential to surpass the theoretical efficiency limit of single-junction ***,the stability of perovskite sub-cells is inferior to that of the c-Si solar cells that have been commercialized,casting serious doubt about the lifetime of the entire *** device operation,light and heat are inevitable,which requires special ***,we review the current understandings of the intrinsic stability of perovskite/c-Si tandems upon light and/or heat ***,we summarize the recent understandings regarding light facilitated ion migration,materials decomposition,and phase *** addition,the reverse bias effect on the stability of tandem modules caused by uneven illumination is ***,this review also summarizes the thermalinduced degradation and mismatch issue,which underlines the system design of perovskite/c-Si ***,recent strategies to improve the intrinsic stability of perovskite/c-Si tandems under light and/or heat are reviewed,such as composition engineering,crystallinity enhancement,interface modification,material optimization,and device structure *** last,we present several potential research directions that have been overlooked,and hope those are helpful for future research on perovskite based tandem solar cells.

关键词： perovskite c-Si tandem solar cell light stability thermal stability photovoltaic module

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The stability of inorganic perovskite solar cells:from materials to devices

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Materials Futures 2023年第3期2卷 21-37页

作者： Bingcheng Yu Shan Tan Dongmei Li Qingbo Meng Beijing National Laboratory for Condensed Matter Physics Renewable Energy LaboratoryInstitute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190People’s Republic of China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101407People’s Republic of China College of Materials Science and Opto-Electronic Technology University Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China

Inorganic halide perovskite solar cells(IHPSCs)have become one of the most promising research hotspots due to to the excellent light and thermal stabilities of inorganic halide perovskites(IHPs).Despite rapid progress in cell performance in very recent years,the phase instability of IHPs easily occurs,which will remarkably influence the cell efficiency and *** effort has been devoted to solving this *** this review,we focus on representative progress in the stability from IHPs to IHPSCs,including(i)a brief introduction of inorganic perovskite materials and devices,(ii)some new additives and fabrication methods,(iii)thermal and light stabilities,(iv)tailoring phase stability,(v)optimization of the stability of inorganic perovskite solar cells and(vi)interfacial engineering for stability ***,perspectives will be given regarding future work on highly efficient and stable *** review aims to provide a thorough understanding of the key influential factors on the stability of materials to highly efficient and stable IHPSCs.

关键词： inorganic halide perovskites inorganic halide perovskite solar cells light stability thermal stability phase instability

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Photo-stable perovskite solar cells with reduced interfacial recombination losses using a CeO interlayer

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Science China Materials 2021年第8期64卷 1858-1867页

作者： Xiaoqiang Shi Ye Tao Zhuoxin Li Huirong Peng Molang Cai Xuepeng Liu Zhongyan Zhang Songyuan Dai Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChina

Despite demonstrating remarkable power conversion efficiencies(PCEs), perovskite solar cells(PSCs) have not yet achieved their full potential. In particular, the interfaces between the perovskite and charge transport layers account for the vast majority of the recombination *** contact and band alignment between the lowtemperature-processed TiO_(2) electron transport layer(ETL)and the perovskite are essential to minimize nonradiative recombination losses. In this study, a CeOx interlayer is employed to modify the perovskite/TiO_(2) interface, and the charge transport properties of the devices are investigated. The bilayer-structured TiO_(2)/CeOx ETL leads to the modification of the interface energetics, resulting in improved electron extraction and reduced nonradiative recombination in the *** based on TiO_(2)/CeOx ETL exhibit a high open-circuit voltage(Voc) of 1.13 V and an enhanced PCE of more than 20%as compared with Vocof 1.08 V and a PCE of approximately 18% for TiO^(2-)based devices. Moreover, PSCs based on TiO_(2)/CeOx ETL maintain over 88% of their initial PCEs after light illumination for 300 min, whereas PSCs based on TiO_(2) ETL almost failed. This study provides an efficient strategy to enhance the PCE and stability of PSCs based on a lowtemperature-processed TiO_(2) ETL.

关键词： perovskite solar cell interface passivation recombination light stability CeOx

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A Convenient Synthesis and Properties of Ru(bpy)_2[bpy(CO_2H)-(CO_2Et)](PF_6)_2 Photosensitive Dye

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Chinese Chemical Letters 2004年第8期15卷 969-972页

作者： ShiGuoSUN XiaoJunPENG YongQianXU LeiSHI ZhenGUO LiChengSUN StateKeyLaboratoryofFineChemicals DalianUniversityofTechnologyDalian116012

A novel Ru(Ⅱ) tris-bipyridyl complex, Ru(bpy)2[bpy(CO2H)(CO2Et)][PF6]2 is prepared in a simple and convenient process. It will be an alternativ?of Ru(bpy)2bpy(CO2Et)2(PF6)2 to be used in solar cel須 as photosensitive... 详细信息

关键词： Ruthenium(Ⅱ) tris-bipyridyl complex photosensitive dyes light stability electrochem-istry.

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