Chlorine-assisted recovery of performance loss in MAPbI3 solar cells caused by low purity of PbI2

Minlin Jiang; Zuo Wang; Yi Zhou; Nanrun Zhou; Lihua Gong

doi:10.1117/1.JPE.9.015502

21 March 2019 Chlorine-assisted recovery of performance loss in MAPbI₃ solar cells caused by low purity of PbI₂

Minlin Jiang, Zuo Wang, Yi Zhou, Nanrun Zhou, Lihua Gong

Author Affiliations +

Journal of Photonics for Energy, Vol. 9, Issue 1, 015502 (March 2019). https://doi.org/10.1117/1.JPE.9.015502

Abstract

We report an exciting discovery that the performance loss in MAPbI₃ solar cells due to low purity of PbI₂ can be fully recovered by adding a small amount of Cl source (MACl). The averaged efficiency of MAPbI₃ solar cells using low-purity PbI₂ is 14.16%, whereas that using high-purity PbI₂ is 16.39%. Excitingly, the averaged efficiency of MAPbI₃ solar cells using low-purity PbI₂ is boosted to 16.58% by adding a small amount of MACl into MAPbI₃ precursor, which is comparable to that from high-purity PbI₂. Results from scanning electron microscopy and x-ray diffraction indicate that the morphologies and structures of MAPbI₃ thin films are not affected by the purity of PbI₂ and the addition of small amount of Cl source. Further investigations using open-circuit voltage decay and admittance spectroscopy (AS) reveal that low purity of PbI₂ leads to lower electron lifetime due to higher defect density, whereas the addition of Cl can suppress the defect density, resulting into higher electron lifetime. This discovery may offer a great opportunity for fabricating low-cost, high-efficiency perovskite solar cells using low-purity feedstocks, which would definitely expedite the development of environment-friendly perovskite solar cells.

Citation Download Citation

Minlin Jiang, Zuo Wang, Yi Zhou, Nanrun Zhou, and Lihua Gong "Chlorine-assisted recovery of performance loss in MAPbI₃ solar cells caused by low purity of PbI₂," Journal of Photonics for Energy 9(1), 015502 (21 March 2019). https://doi.org/10.1117/1.JPE.9.015502

Received: 12 November 2018; Accepted: 27 February 2019; Published: 21 March 2019

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