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Largely Enhanced VOC and Stability in Perovskite Solar Cells with Modified Energy Match by Couple 2D Interlayers

Abstract

Due to the use of a low-temperature solution process and the absence of hysteresis, PEDOT:PSS based p-i-n perovskite solar cells (PVSCs) have some obvious advantages, such as simple device technology, suitability for flexible and large size substrates, and long-time stability. However, so far their power conversion efficiency (PCE) has been much lower than that of other types of PVSCs, and in particular, they have a much lower open-circuit voltage (VOC). In this research, the PEDOT:PSS based PVSCs achieve a large enhancement of VOC, PCE and device stability by using 2D materials like graphene oxide (GO) and MoS2 as interface layers. The CH3NH3PbI3 based PVSC with the GO and MoS2 layers shows VOC increases from 0.962 to 1.135 V and PCE enhances from 14.15% to 19.14%. When a Br-doped perovskite of CH3NH3PbI2.5Br0.5 is used as the active layer, the Voc is enhanced from 1.010 to 1.176 V. The modified energy match at electrode interfaces plays a key role in the enhancement of device performance. This work indicates that 2D materials are important materials for use in interfaces of perovskite solar cells to largely enhance device performance and stability.

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Supplementary files

Publication details

The article was received on 27 Dec 2017, accepted on 12 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C7TA11295E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Largely Enhanced VOC and Stability in Perovskite Solar Cells with Modified Energy Match by Couple 2D Interlayers

    Y. Wang, S. Wang, X. Chen, Z. Li, J. Wang, T. Li and X. Deng, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA11295E

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