Efficient and Stable Planar n‐i‐p Perovskite Solar Cells with Negligible Hysteresis through Solution‐Processed Cu2O Nanocubes as a Low‐Cost Hole‐Transport Material. Issue 16 (22nd July 2019)

• Record Type: Journal Article
• Authors: Elseman, Ahmed Mourtada; Selim, Mohamed S.; Luo, Lie; Xu, Cun Yun; Wang, Gang; Jiang, Yi; Liu, De Bei; Liao, Li Ping; Hao, Zhifeng; Song, Qun Liang
• Is Part Of: ChemSusChem. Volume 12:Issue 16(2019)
• Page Start: 3808
• Page End: 3816
• Publication Date: 2019-07-22
• Subjects: cuprous oxide -- hole transport material -- nanocubes -- perovskite solar cells -- solution processing; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201901430
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Organic–inorganic halide perovskite solar cells (PSCs) have reached certified efficiencies of over 23 % with expensive organic hole‐transporting materials. However, the use of an inorganic hole‐transport layer (HTL) remains crucial as it would reduce cost combined with higher mobility and stability. In this direction, the application of Cu2 O as the top layer in PSCs is still complicated owing to the difficulty of solution processing. Herein, a solution‐processing method is reported for preparing Cu2 O nanocubes as a p‐type HTL in regular structure ( n‐i‐p ) PSCs. The controlled synthesis of Cu2 O nanocubes in a size range of 60–80 nm is achieved without using any surfactants, which are usually toxic and tricky to remove. The new structure of these Cu2 O nanocubes enhances the carrier mobility with preferable energy alignment to the perovskite layer and superb stability. The PSCs based on these Cu2 O nanocubes HTMs could achieve an efficiency exceeding 17 % with high stability, whereas organic P3HT‐based PSCs display an efficiency of 15.59 % with a poorer running stability. This indicates that Cu2 O nanocubes are a promising HTM for efficient and stable PSCs. Abstract : Better than organic : Controlled synthesis of Cu2 O nanocubes is attempted using as a green solution‐processing technique for development as a hole‐transport material (HTM). The nanocubes are applied to traditional n‐i‐p perovskite solar cells. The Cu2 O nanocube‐based devices demonstrate stability and efficiency over 17 % with negligible hysteresis, which is better than that of devices based on P3HT (15.5 %).