锡基钙钛矿薄膜的稳定性及其太阳能电池（高蔚茵，J. Phys. Chem. Lett. 2018, 9, 6999−7006）
- 发布时间：
- 2018-12-09
- 文章标题：
- 锡基钙钛矿薄膜的稳定性及其太阳能电池（高蔚茵，J. Phys. Chem. Lett. 2018, 9, 6999−7006）
- 内容：
Robust Stability of Efficient Lead-Free Formamidinium Tin Iodide Perovskite Solar Cells Realized by Structural Regulation
Weiyin Gao,a Chenxin Ran,a Jingrui Li,b Hua Dong,a Bo Jiao,a Lijun Zhang,c Xuguang Lan,d Xun Hou,a and Zhaoxin Wu*,a
aKey Laboratory of Photonics Technology for Information, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China
bDepartment of Applied Physics, Aalto University, FI-00076 AALTO, Finland
cState Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, and College of Materials Science and Engineering, Jilin University, Changchun 130012, China
dInstitute of Artificial Intelligence and Robotics, Xi’an Jiaotong University, Xi’an 710049, China
Abstract
Tin (Sn) based perovskite materials are considered to be the most promising lead (Pb) alternative in perovskite solar cells (PSCs). However, the instability issue of Sn based perovskite is still one of the biggest challenges in Pb-free PSCs. Herein, a structural regulation strategy is demonstrated to regulate the geometric symmetry of formamidiniumtin iodide (FASnI3) perovskite. The introduction of cesium cation (Cs+) is found to improve the geometric symmetry, suppress the oxidation of Sn2+, and enhance the thermodynamical structural stability of FASnI3 structure. As a result, the inverted planer Cs-doped FASnI3-based PSC without encapsulation is shown to maintain 90% of its initial power-conversion efficiency (PCE) after 2000 h when storing in N2, which is the best durability so far for 3D Sn-based PSCs. Most importantly, the air, thermal, and illumination stability of the PSCs are all improved after Cs doping. In addition, the PCE of the Cs-doped PSC shows a 63% increase compared to control device (from 3.74% to 6.08%) due to the improved quality of Cs-doped FASnI3 film. This work provides a facile strategy for enhancing the performance (both stability and PCE) of FASnI3-based photovoltaic devices.
Keywords: lead-free perovskite; solar cells; structural stability; device stability