Formation of pristine CuSCN layer by spray deposition method for efficient perovskite solar cell with extended stability. (February 2017)

• Record Type: Journal Article
• Authors: Yang, In Seok; Sohn, Mi Rae; Sung, Sang Do; Kim, Yong Joo; Yoo, Young Jun; Kim, Jeongho; Lee, Wan In
• Is Part Of: Nano energy. Volume 32(2017:Feb.)
• Page Start: 414
• Page End: 421
• Publication Date: 2017-02
• Subjects: CuSCN -- Spray deposition -- Perovskite solar cell -- Hole transporting material -- Stability; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.12.059
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: By employing CuSCN, a low-cost inorganic hole transporting material (HTM), CH3 NH3 PbI3 perovskite solar cell (PSC) devices with high efficiency and extended stability were successfully fabricated in this work. In particular, we developed a facile method of depositing CuSCN layer reproducibly by a simple spray deposition technique, which allows the formation of the CuSCN layer without any significant damage of the underlying CH3 NH3 PbI3 layer. The fabricated PSC with ~50 nm-thick pristine CuSCN layer exhibits the photovoltaic conversion efficiency (PCE) of 17.10% with J SC of 23.10 mA/cm 2, V OC of 1, 013 mV and FF of 0.731. Compared with conventional PSCs based on spiro-OMETAD HTM, the PSC employing CuSCN exhibits higher value of J SC, suggesting that CuSCN transports holes more efficiently than spiro-OMETAD. Furthermore, PSCs employing the pristine CuSCN demonstrate a remarkable long-term stability at ambient condition with the decrease of PCE by only 5.8% after 100 days. In addition, the PCE decrease during the encapsulation process at 120 °C was merely 13%, which is much lower value than ~70% observed for the conventional device based on spiro-OMETAD, indicating excellent thermal stability of the CuSCN-based PSCs. Graphical abstract: Highlights: A facile spray deposition technique to deposit the CuSCN HTM layer is developed. The perovskite layer is not appreciably damaged during the spray deposition of CuSCN. Perovskite solar cell (PSC) with the pristine CuSCN layer exhibits PCE of 17.10%. PSCs with the CuSCN demonstrate remarkable long-term and thermal stabilities.