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

By Wei Zhang, Sandeep Kumar Pathak, Nobuya Sakai, T. Stergiopoulos, P. Nayak, Nakita K. Noel, A. Haghighirad, Victor M. Burlakov, D. deQuilettes, A. Sadhanala and 5 more. Nature Communications, 2015

661 citations recorded by the source corpus.

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. An imbalance in I/Pb stoichiometry is thought to lead to defects in metal halide films. Here, Zhang et al. show that the addition of hypophosphorous acid in the precursor solution can significantly improve the film quality and enhance the photoluminescence intensity, leading to improved photovoltaic devices.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/7eb00445a702626065fd0d72c3bb77aed5e421fd

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Citations in the corpus

Metal Halide Perovskite Polycrystalline Films Exhibiting Properties of Single Crystals (2017, positive): “Hypophosphorous acid was added according to the method described by Zhang et al.(18) The precursor solution was then spin coated onto the substrates at 2,000 rpm for 45 s in an inert atmosphere.”