Bottom-up passivation effects by using 3D/2D mix structure for high performance p-i-n perovskite solar cells. (15th July 2020)

• Record Type: Journal Article
• Authors: Li, Jiawen; Wu, Mengge; Yang, Genjie; Zhang, Dayong; Wang, Zijun; Zheng, Ding; Yu, Junsheng
• Is Part Of: Solar energy. Volume 205(2020)
• Page Start: 44
• Page End: 50
• Publication Date: 2020-07-15
• Subjects: Perovskite solar cells -- 3D/2D mix structure -- 2D perovskite -- Bottom-up passivation effects -- High performance; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2020.05.042
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Introducing a 3D/2D mix structure by using PEABr. Bottom-up passivation effect is achieved. Trap-state density and nonradiative recombination are reduced. The PCE was improved from 17.59% to 19.46%. Exhibiting superior stability due to the hydrophobic nature of 2D perovskite. Abstract: Perovskite solar cells (PSCs) have shown a great potential in the field of alternative energy due to their superior performance and processing compatibility. However, prior to commercialization, a major drawback of poor stability needs to be addressed imperatively. Recently, mixing 3D and 2D perovskite as active layer is a promising strategy for blocking water and oxygen to increase stability, as well as mitigating the effect of insulated spacer in bulk to strengthen charge migration. Here, we report a novel method to fabricate high-performance inverted PSCs by involving Phenethylammonium bromide (PEABr) as passivator. During the fabrication, PEABr will diffuse into 3D perovskite and form a mixed 3D/2D structure at the lower interface. This ingenious structure will restrain the charge recombination and reduce the trap state density at the transport layer/perovskite interface and bulk of 3D perovskite. Due to the bottom-up passivation effects, mixed 3D/2D PSCs achieve an improved PCE from 17.59% to 19.46%, in combination with enhanced long-term air stability. This 3D/2D mix structure demonstrates a great potential for developing high-performance and high stability PSCs.