Enhanced photovoltaic performance and stability in mixed-cation perovskite solar cells via compositional modulation. (1st September 2017)

• Record Type: Journal Article
• Authors: Li, Xin; Yang, Junyou; Jiang, Qinghui; Chu, Weijing; Zhang, Dan; Zhou, Zhiwei; Ren, Yangyang; Xin, Jiwu
• Is Part Of: Electrochimica acta. Volume 247(2017)
• Page Start: 460
• Page End: 467
• Publication Date: 2017-09-01
• Subjects: Compositional modulation -- Mixed organic cation -- Enhanced photoelectric performance -- Long term stability -- Perovskite solar cells; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.07.040
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: A pure phase of FA1-x MAx PbI3 perovskite FA1-x MAx PbI3 was prepared. Discussing effect of chemical composition and morphology on the photovoltaic performance in detail. The PCE of PKSC based on FA0.7 MA0.3 PbI3 reaches up to 16.0%. The long term stability and reproducibility is obtained. Abstract: Preparation of high-quality and pure phase mixed-organic-cation FA1-x MAx PbI3 perovskite film is a big challenge, especially on a porous oxide scaffold for mesoscopic perovskite solar cells. In this study, we fabricated a pure phase of mixed-organic-cation perovskite FA1-x MAx PbI3 simply using a conventional two-step method. Effect of chemical composition and morphology on the photovoltaic performance and stability of the mixed-organic-cation perovskite has been studied in details. Results show that the FA1-x MAx PbI3 perovskite thin films with a FA + :MA + molar ratio of 0.7:0.3 demonstrate the best photovoltaic performance. Mesoscopic perovskite solar cells fabricated using these FA0.7 MA0.3 PbI3 thin films yield a power conversion efficiency (PCE) up to 16.0%. Moreover, the devices present a superior stability and the unsealed devices exposed in ambient condition (25 °C, 50%–60% relative humidity) can maintain their photoelectric performance without apparent PCE loss for up to 20 days.