钙钛矿太阳能电池的内建电场调控策略研究进展  

Progress on strategies to control the built-in electric field of perovskite solar cells

作　　者：张世宁 张贤 杨爽 俞文锦 任博文 吴存存 肖立新[3] Shining Zhang;Xian Zhang;Shuang Yang;Wenjin Yu;Bowen Ren;Cuncun Wu;Lixin Xiao(Department of Science,Hebei University of Technology,Tianjin 300401,China;Department of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China;Department of Physics,Peking University,Beijing 100871,China)

机构地区：[1]河北工业大学理学院,天津300401 [2]河北工业大学材料科学与工程学院,天津300401 [3]北京大学物理学院,北京100871

出　　处：《科学通报》2023年第1期39-52,共14页Chinese Science Bulletin

基　　金：国家自然科学基金(62104059);河北省自然科学基金(F2021202044);河北省高等教育科学技术研究项目(ZD2021031)资助。

摘　　要：钙钛矿太阳能电池(perovskite solar cells,PSCs)作为一种高效率、低成本的光伏器件引起了国内外学者的广泛关注.电池内部的载流子分离和传输是器件工作的核心过程,直接关系到器件的光电转化效率.异质结形成的内建电场主导着载流子的行为,其强度大小决定器件中电子和空穴的分离效率,所以对内建电场的调控和优化可以从根本上提升电池的性能.本文首先对钙钛矿太阳能电池中的内建电场以及载流子分离机制进行介绍,然后对目前常见的钙钛矿太阳能电池内建电场的调控策略及其对器件性能的影响进行总结,主要包括通过掺杂、构建三维/二维钙钛矿异质结、构建偶极层等调控钙钛矿太阳能电池的内建电场.最后,对钙钛矿太阳能电池的内建电场调控技术进行评价,并对未来该领域的发展进行展望.Perovskite solar cells(PSCs)are high-efficiency and low-cost photovoltaic devices that have been extensively studied by researchers around the world.The carrier separation and transport inside the solar cell is the key process of the device operation,which is directly related to the photoelectric conversion efficiency(PCE)of the device.The built-in electric field formed by the heterojunction dominates the behavior of carriers,and its strength determines the separation efficiency of electrons and holes in the device.Therefore,regulating and optimizing the built-in electric field can fundamentally improve the performance of the solar cells.Much work is focusing on the built-in electric field for the fabrication of high-efficiency devices.According to previous results,this paper firstly introduces some fundamental experiments on the heterojunctions and the mechanism of carrier separation and transport of PSCs.Secondly,the regulation strategies of the built-in electric field commonly used in perovskite solar cells and their effects on device performance are summarized.The following are the most common built-in electric field control strategies:(1)Tuning the built-in electric field of perovskite solar cells by doping.The method of doping to control the built-in electric field is to add appropriate impurities according to different conductive properties of the materials.According to the structure of planar perovskite solar cells,doping the electron transport layer,hole transport layer,and perovskite layer of PSCs with different doping materials can change the position of the Fermi level and further enlarge the splitting of the Fermi level which can assist in the separation and transport of carriers.(2)Tuning the built-in electric field of perovskite cells by constructing 3D/2D perovskite heterojunctions.Fabrication of 3D/2D heterojunctions can not only improve the PCE of perovskite solar cells,but also improve its stability,so this method is more popular among researchers.The construction of 3D/2D perovskite heterojunc

关 键 词：钙钛矿太阳能电池 内建电场 掺杂 三维/二维 偶极层 

分 类 号：TM914.4[电气工程—电力电子与电力传动]