表/界面双重修饰提高钙钛矿太阳能电池性能  

Performance Improvement of Perovskite Solar Cells by Surface/Interface Dual-Modification

作　　者：霍宇 吴治昕 周利通 余春燕[1,2] 翟光美[1,2] Huo Yu;Wu Zhixin;Zhou Litong;Yu Chunyan;Zhai Guangmei(Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,太原030024 [2]太原理工大学材料科学与工程学院,太原030024

出　　处：《微纳电子技术》2023年第11期1746-1755,共10页Micronanoelectronic Technology

基　　金：山西省基础研究计划项目(201701D221079,202103021224055)。

摘　　要：采用二维/三维(2D/3D)钙钛矿结构已被证明是提高钙钛矿太阳能电池综合性能的有效策略,但该策略通常要求表面2D修饰层厚度极薄致使其不能连续覆盖3D钙钛矿层,而未覆盖/修饰的3D钙钛矿表/界面则可能因仍然存在大量缺陷而影响器件性能。基于此,研发了一种简单有效的环己甲胺氢碘酸盐(CMI)+苯乙基碘化铵(PEAI)表/界面双重修饰策略,即利用PEAI修饰由CMI构建的2D/3D钙钛矿结构来实现更为充分的缺陷钝化和界面修饰。结果表明,CMI+PEAI双重修饰钙钛矿薄膜的表面粗糙度和缺陷态密度明显低于未处理和单一CMI表界面修饰的钙钛矿薄膜,分别降至11.3 nm和2.29×10^(15)cm^(-3),且该双重修饰方法将钙钛矿薄膜的光生载流子寿命提高至45.1 ns,并有效促进了钙钛矿/空穴传输界面处的电荷提取,最终使太阳能电池的性能参数得到明显提升。CMI+PEAI双重修饰太阳能电池的平均能量转化效率为20.12%±0.35%,明显优于未处理器件(16.79%±0.57%)及单一CMI表/界面修饰器件(18.81%±0.34%),同时也展现出了最佳稳定性。该研究提供了一种更为充分、有效的钙钛矿表界面修饰/钝化策略,有助于进一步提高钙钛矿太阳能电池的综合性能。The use of two-dimensional/three-dimensional(2D/3D)perovskite structure has been proved to be an effective strategy to improve the comprehensive performance of perovskite solar cells.However,the strategy usually requires the surface 2D modification layer to be so thin that it cannot continuously cover the 3D perovskite layer,and the surface/interface of the uncovered/unmodified 3D perovskite may still affect the device performance due to a large number of defects therein.To address the issue,a simple and effective dual-modification strategy of cyclohexylmethylammonium iodide(CMI)+2-phenylethylammonium iodide(PEAI)surface/interface was developed,that is,the 2D/3D perovskite structure constructed by CMI was further modified with PEAI to achieve more sufficient defect passivation and interface modification.The results show that the surface roughness and defect state density of the CMI+PEAI dual-modified perovskite films are significantly lower than those of untreated and single-CMI surface/interface modified films,which decrease to 11.3 nm and 2.29×10^(15)cm^(-3),respectively.The dualmodification method can increase the lifetime of photogenerated carriers in perovskite films to 45.1 ns.Thus,the charge extraction at the perovskite/hole transport interface is effectively promoted,and then the performance parameters of the solar cell are significantly improved.The average power conversion efficiency of the CMI+PEAI dual-modified solar cells is 20.12%±0.35%,which is obviously better than those of the untreated devices(16.79%±0.57%)and single-CMI surface/interface modified devices(18.81%±0.34%),and the solar cells show the best stability.The study provides a more adequate and effective strategy for perovskite surface/interface modification/passivation,which is helpful to further improve the comprehensive performance of perovskite solar cells.

关 键 词：钙钛矿太阳能电池 表/界面修饰 2D/3D结构 双重修饰 缺陷钝化 

分 类 号：TM914.4[电气工程—电力电子与电力传动]