The modified multi-step thermal annealing process for highly efficient MAPbI3-based perovskite solar cells. (1st November 2018)

• Record Type: Journal Article
• Authors: Jiang, Yaxiao; Pan, Lin; Wei, Dong; Li, Wenbiao; Li, Shaohua; Yang, Shi-E; Shi, Zhifeng; Guo, Haizhong; Xia, Tianyu; Zang, Jinhao; Chen, Yongsheng
• Is Part Of: Solar energy. Volume 174(2018)
• Page Start: 218
• Page End: 224
• Publication Date: 2018-11-01
• Subjects: Perovskite solar cells -- Conventional multi-step annealing method -- Modified multi-step annealing method -- Power conversion efficiency; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2018.09.016
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: A modified multi-step (MMS) thermal annealing method is introduced in the fabrication process of MAPbI3 film. The decomposition of CH3 NH3 PbI3 films is effectively suppressed with MMS process. A maximum PCE of 14.7% for the device treated by MMS method is obtained at 180 °C. Abstract: Since the first report in 2009, the certified power conversion efficiency (PCE) of organic-inorganic halide perovskite solar cells (PSCs) has rapidly risen to 23.3%, which successfully demonstrates the importance of film morphology and quality management, especially for the planar heterojunction architecture based on solution-processed method. In this paper, the morphology, structure, optical and electrical properties of perovskite films treated by two different multi-step thermal annealing methods have been studied and compared. For the conventional multi-step (CMS) annealing method, the surface morphologies and optical properties of films are significantly influenced by the annealing temperature due to the decomposition of CH3 NH3 PbI3 . When the modified multi-step (MMS) method is adopted, the decomposition of CH3 NH3 PbI3 can be effectively suppressed. The best device treated by MMS method at 180 °C showed a short circuit current density of 20.85 mA/cm 2, an open circuit voltage of 0.96 V, a fill factor of 72.7%, and a PCE of 14.7%, which is a 23.5% enhancement in PCE relative to the maximum 11.9% treated by CMS method at 160 °C. These findings suggest that the efficiency of PSCs can be further improved by optimizing the preparation process.