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

Zhang, Wei and Pathak, Sandeep and Sakai, Nobuya and Stergiopoulos, Thomas and Nayak, Pabitra K. and Noel, Nakita K. and Haghighirad, Amir A. and Burlakov, Victor M. and deQuilettes, Dane W. and Sadhanala, Aditya and Li, Wenzhe and Wang, Liduo and Ginger, David S. and 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 . p. 10030. ISSN 2041-1723

Full content URL: http://dx.doi.org/10.1038/ncomms10030

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Abstract

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.

Keywords:Optoelectronic devices, JCOpen
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
ID Code:22656
Deposited On:15 Mar 2016 12:55

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