Polymer hole-transport material improving thermal stability of inorganic perovskite solar cells

• Published in: Frontiers of Optoelectronics (Online) Vol. 13; no. 3; pp. 265 - 271
• Main Authors: Mu, Shaiqiang, Ye, Qiufeng, Zhang, Xingwang, Huang, Shihua, You, Jingbi
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.09.2020; Springer Nature B.V
• Subjects: Biomedical Engineering and Bioengineering; Cesium; Electrical Engineering; Energy conversion efficiency; Engineering; Indium tin oxides; Lithium fluoride; Perovskites; Photovoltaic cells; Physics; Research Article; Solar cells; Thermal stability; Tin dioxide; inorganic perovskite solar cell (PSC); holetransport material (HTM); stability
• ISSN: 2095-2759; 2095-2767; 2095-2767
• DOI: 10.1007/s12200-020-1041-z

Cesium-based inorganic perovskite solar cells (PSCs) are paid more attention because of their potential thermal stability. However, prevalent salt-doped 2,2′,7,7′-tetrakis(N,N-dipmethoxyphenylamine)9,9′-spirobifluorene (Spiro-OMeTAD) as hole-transport materials (HTMs) for a high-efficiency inorganic device has an unfortunate defective thermal stability. In this study, we apply poly (3-hexylthiophene-2,5-diyl) (P3HT) as the HTM and design all-inorganic PSCs with an indium tin oxide (ITO)/SnO 2 /LiF/CsPbI 3− x Br x /P3HT/Au structure. As a result, the CsPbI 3 − x Br x PSCs achieve an excellent performance of 15.84%. The P3HT HTM-based device exhibits good photo-stability, maintaining ∼80% of their initial power conversion efficiency over 280 h under one Sun irradiation. In addition, they also show better thermal stability compared with the traditional HTM Spiro-OMeTAD.