title: Fabrication of efficient planar perovskite solar cells using a one-step chemical vapor deposition method.
abstract: Organometallic trihalide perovskites are promising materials for photovoltaic applications, which have demonstrated a rapid rise in photovoltaic performance in a short period of time. We report a facile one-step method to fabricate planar heterojunction perovskite solar cells by chemical vapor deposition (CVD), with a solar power conversion efficiency of up to 11.1%. We performed a systematic optimization of CVD parameters such as temperature and growth time to obtain high quality films of CH3NH3PbI3 and CH3NH3PbI(3-x)Clx perovskite. Scanning electron microscopy and time resolved photoluminescence data showed that the perovskite films have a large grain size of more than 1 micrometer, and carrier life-times of 10 ns and 120 ns for CH3NH3PbI3 and CH3NH3PbI(3-x)Clx, respectively. This is the first demonstration of a highly efficient perovskite solar cell using one step CVD and there is likely room for significant improvement of device efficiency.
authors.affiliation: Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Mohammad Mahdi
authors.initials: MM
authors.lastname: Tavakoli
authors.affiliation: Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Leilei
authors.initials: L
authors.lastname: Gu
authors.affiliation: Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Physics and Materials Science &Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR, China.
authors.forename: Claas
authors.initials: C
authors.lastname: Reckmeier
authors.affiliation: Shenzhen SOC Key Laboratory, Peking University-HKUST Shenzhen-Hong Kong Institution, Shenzhen 518051, China.
authors.forename: Jin
authors.initials: J
authors.lastname: He
authors.affiliation: Department of Physics and Materials Science &Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR, China.
authors.forename: Andrey L
authors.initials: AL
authors.lastname: Rogach
authors.affiliation: Department of Electrical and Computer Engineering, University of Houston, Houston, Texas, 77204, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Fan