CH3NH3PbI3:MoS2 heterostructure for stable and efficient inverted perovskite solar cell. (1st January 2020)

• Record Type: Journal Article
• Authors: Liu, Zhiyong; Liu, Kaikai; Zhang, Feipeng; Jain, Sagar M.; He, Tingwei; Jiang, Yuanzhi; Liu, Pengfei; Yang, Jien; Liu, Hairui; Yuan, Mingjian
• Is Part Of: Solar energy. Volume 195(2020)
• Page Start: 436
• Page End: 445
• Publication Date: 2020-01-01
• Subjects: Perovskite solar cells -- Buffer layer -- MoS2 additives -- Heterogeneous structure -- Lattice-matching -- Stability; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2019.11.030
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: Double modification – simultaneously using MoS2 as buffer layer and additives. MoS2 film acts as a protective and ideal electron blocking candidate. MoS2 doped CH3 NH3 PbI3, enhance the quality of the perovskite film. CH3 NH3 PbI3 : MoS2 heterojunction promote charge transfer. Abstract: Organic-inorganic perovskite solar cells emerge as one of the most promising photovoltaic technology due to its high performances. Particularly, inverted perovskite device architecture, due to low temperature processing, have a great potential in commercialization. High-crystalline quality perovskite film and interfacial passivation are essential to yield high performance devices. In this work, we employ a simple strategy of using molybdenum disulfide (MoS2 ) as both the interfacial layer and the additive to prepare efficient PSCs. MoS2 as an additive in perovskite can form the CH3 NH3 PbI3 :MoS2 heterostructure, resulting in the homogeneous perovskite film with larger crystal grains. In addition, MoS2 as the buffer layer (BL) between poly (3, 4-ethylene dioxythiophene)-poly (styrene sulfonate) (PEDOT:PSS) and perovskite can prevent the decomposition of perovskite film by avoiding the direct contact with the hydrophilic PEDOT:PSS films. On tedious optimization, the champion device based on active layer of CH3 NH3 PbI3 :MoS2 (10 v%) as well as employing MoS2 buffer layer shows a remarkable improvement in the power conversion efficiency (PCE) (from 15.29% to 18.31%) and a better stability, with 87% of the initial efficiency sustained after 20 days. Our finding herein provides a promising way to fabricate high efficiency and stable photovoltaic devices.