Статья

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

Wei ZhangClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKSandeep PathakClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKNobuya SakaiClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKΘωμάς ΣτεργιόπουλοςClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKPabitra K. NayakClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKNakita K. NoelClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKAmir A. HaghighiradClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKV. M. BurlakovClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UKDane W. deQuilettesDepartment of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USAAditya SadhanalaCavendish Laboratory, Department of Physics, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, UKWenzhe LiDepartment of Chemistry, Tsinghua University, Beijing 100084, ChinaLiduo WangDepartment of Chemistry, Tsinghua University, Beijing 100084, ChinaDavid S. GingerDepartment of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USARichard H. FriendCavendish Laboratory, Department of Physics, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, UKHenry J. SnaithClarendon Laboratory, Department of Physics, University of Oxford, Parks road, Oxford OX1 3PU, UK

2015en

ABI

Аннотация

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.

Перевод пока недоступен

Идентификаторы

DOI: 10.1038/ncomms10030

Цитирования и источники

Цитирований: 5Использованных источников: 0

Показатели — AkademScholar