平面型钙钛矿太阳能电池温度相关的光伏性能时间响应特性  

Temperature-dependent time response characteristic of photovoltaic performance in planar heterojunction perovskite solar cell

作　　者：曹汝楠 徐飞[1,2] 朱佳斌[1] 葛升[3] 王文贞[3] 徐海涛[3] 徐闰[3] 吴杨琳 马忠权[1] 洪峰[1] 蒋最敏[2] 

机构地区：[1]上海大学物理系,索朗光伏材料与器件R&D联合实验室,上海市高温超导重点实验室,上海200444 [2]复旦大学物理系,应用表面物理国家重点实验室,微纳光子结构教育部重点实验室,上海200433 [3]上海大学电子信息材料系,上海200444

出　　处：《物理学报》2016年第18期321-329,共9页Acta Physica Sinica

基　　金：复旦大学应用表面物理国家重点实验室(批准号:KF2015_01);国家自然科学基金(批准号:61274067,60876045)资助的课题~~

摘　　要：本文研究了钙钛矿太阳能电池不同工作温度下光伏性能的时间响应特性.结果表明,钙钛矿太阳能电池光伏性能需要经过一段时间光照后才能达到稳定.且随着工作温度降低,电池光伏性能达到稳定所需的响应时间也越长.当电池达到稳定后,电池开路电压会随着温度降低而增大.在此之前,开路电压会在低温下发生显著的衰减.这意味着钙钛矿太阳能电池的时间响应主要来源于其内部内建电场的缓慢变化.通过测量光照前后电池外量子效率发现,光生载流子的分离和收集效率会在光照后得到明显改善.这也暗示了内建电场在光照前后发生了改变.钙钛矿材料中的离子迁移被认为是引起内建电场发生变化的原因.这有助于更好地理解钙钛矿太阳能电池中载流子输运机制.In recent years,perovskite solar cell（PSC） has achieved power conversion efficiency as high as over 20 %,making it competitive with high-efficiency thin film solar cells such as Cu In Ga Se and Cd Te solar cells.However,the critical issue of reliability and stability for PSC should be addressed since a significant degradation of photovoltaic（PV） performance at low temperature has been found regardless of planar mesoporous PSC.To reveal the degradation of PV performance in PSC,the temperature-dependent PV performance of the planar PSC is investigated in detail.A PSC sample is loaded into a cryostat chamber connected to a compressor and illuminated by a halogen lamp.The operating temperature varies from 200 K to 325 K and the current-voltage（J-V） characteristic of planar PSC is measured at different scan rates from 10 V/s to 0.0017 V/s.At a fast scan rate of 10 V/s,the PSC shows a low PV performance at either low temperature or high temperature.The short-circuit current（JSC）,open-circuit voltage（VOC） and maximum power point（PMPP） are found to decline with the temperature decrteasing.Moreover,the J-V curve also shows the S-shape characteristic.This suggests that the inefficient transport of photo-generated carriers occurs in the PSC.Ions such as Pb^2＋,CH3NH^3＋ and I-vacancies cause the screening effect of built-in field and the photo-generated carriers cannot be separated nor collected efficiently.As a result,JSCand VOCshow small values in J-V curves measured at a fast scan rate.However,the degradation in PV performance is temporary.The PV performance gradually reaches a steady state at different operating temperatures with scan rate going down to 0.0017 V/s.The PMPP and VOC increase with temperature decreasing.These results indicate that a long illumination time is necessary for PSC to reach a steady state.After long-time illumination under biased condition（i.e.,J-V curves measured at slow scan rate）,the built-in field is compensated for by the external bias and the ions piling in th

关 键 词：钙钛矿太阳能电池 时间响应 离子迁移 量子效率 

分 类 号：TM914.4[电气工程—电力电子与电力传动]