Journal
SOLAR ENERGY
Volume 195, Issue -, Pages 436-445Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2019.11.030
Keywords
Perovskite solar cells; Buffer layer; MoS2 additives; Heterogeneous structure; Lattice-matching; Stability
Categories
Funding
- Natural Science Foundation of Henan Province [182300410178]
- Key Scientific and Technological Project of Henan Province [182102210373]
- Natural Science Foundation of China (NSFC) [51502081, 21402042]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [663830]
- Welsh assembly Government
- Supergen Solar Challenge
- Marie-Curie COFUND fellowship
- EPSRC [EP/N020863/1] Funding Source: UKRI
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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 CH3NH3PbI3: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 CH3NH3PbI3: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.
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