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Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells

Zhang, Wei, Pathak, Sandeep, Sakai, Nobuya, Stergiopoulos, Thomas, Nayak, Pabitra K., Noel, Nakita K., Haghighirad, Amir A., Burlakov, Victor M., deQuilettes, Dane W., Sadhanala, Aditya , Li, Wenzhe, Wang, Liduo, Ginger, David S., Friend, Richard H. and Snaith, Henry J. (2015) Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells Nature Communications, 6.

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Solution-processed metal halide perovskite semiconductors, such as CH3NH3PbI3, have exhibited remarkable performance in solar cells, despite having non-negligible density of defect states. A likely candidate is halide vacancies within the perovskite crystals, or the presence of metallic lead, both generated due to the imbalanced I/Pb stoichiometry which could evolve during crystallization. Herein, we show that the addition of hypophosphorous acid (HPA) in the precursor solution can significantly improve the film quality, both electronically and topologically, and enhance the photoluminescence intensity, which leads to more efficient and reproducible photovoltaic devices. We demonstrate that the HPA can reduce the oxidized I2 back into I−, and our results indicate that this facilitates an improved stoichiometry in the perovskite crystal and a reduced density of metallic lead.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Pathak, Sandeep
Sakai, Nobuya
Stergiopoulos, Thomas
Nayak, Pabitra K.
Noel, Nakita K.
Haghighirad, Amir A.
Burlakov, Victor M.
deQuilettes, Dane W.
Sadhanala, Aditya
Li, Wenzhe
Wang, Liduo
Ginger, David S.
Friend, Richard H.
Snaith, Henry J.
Date : 30 November 2015
DOI : 10.1038/ncomms10030
Copyright Disclaimer : This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Uncontrolled Keywords : Chemical physics; Optoelectronic devices and components; Solar cells; Surfaces, interfaces and thin films
Depositing User : Clive Harris
Date Deposited : 01 Jun 2017 12:41
Last Modified : 16 Jan 2019 18:52

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