Efficient and highly light stable planar perovskite solar cells with graphene quantum dots doped PCBM electron transport layer. (October 2017)

• Record Type: Journal Article
• Authors: Yang, Zhengrui; Xie, Jiangsheng; Arivazhagan, V.; Xiao, Ke; Qiang, Yaping; Huang, Kun; Hu, Ming; Cui, Can; Yu, Xuegong; Yang, Deren
• Is Part Of: Nano energy. Volume 40(2017:Oct.)
• Page Start: 345
• Page End: 351
• Publication Date: 2017-10
• Subjects: Perovskite solar cell -- Light stability -- Graphene quantum dots -- PCBM -- Electrical conductivity; 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.2017.08.008
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) have triggered a great deal of research on organic electron transport layers, such as phenyl C61 butyric acid methyl ester (PCBM), due to their potential application as a strong contender in photovoltaic industry with simple fabrication process and low cost. However, the low electrical conductivity and electron mobility of PCBM hinder the promotion of PSCs. Here we report a successful case of graphene quantum dots (GQDs) doping into PCBM electron transport layer (ETL) of planar N-I-P PSCs, resulting in an obvious increase in PCBM conductivity together with the enhanced charge extraction and reduced the trap state density of perovskite films. A low doping ratio (0.5 wt%) would be efficient to boost the V oc, J sc and FF, a PCE of 17.56% is achieved. More importantly, the light stability of PSCs with PCBM: GQDs was improved: the unpackaged cells can keep > 80% of the initial PCE under simulated sunlight with the full UV component present after 300 h, in contrast to the reference device that dropped < 50% during the same period of time. Graphical abstract: Highlights: We demonstrate for the first time the utilization of GQDs as an additive to PCBM. The device maintains ~80% of its PCE under continuous 300 h full spectrum sunlight. GQDs: PCBM resulted in a high efficient (17.56%) PSC with negligible hysteresis. All component layers are deposited at room temperature and treated below 100 °C.