Thin-film semiconductor perspective of organometal trihalide perovskite materials for high-efficiency solar cells

Publication date: March 2016 Source:Materials Science and Engineering: R: Reports, Volume 101 Author(s): Zhengguo Xiao, Yongbo Yuan, Qi Wang, Yuchuan Shao, Yang Bai, Yehao Deng, Qingfeng Dong, Miao Hu, Cheng Bi, Jinsong Huang Organometal trihalide perovskites (OTPs) are arising as a new generation of low-cost active materials for solar cells with efficiency rocketing from 3.5% to over 20% within only five years. From “dye” in dye-sensitized solar cells (DSSCs) to “hole conductors” and “electron conductors” in mesoscopic heterojunction solar cells, there has been a dramatic conceptual evolution on the function of OTPs in photovoltaic devices. OTPs were originally used as dyes in Grätzel cells, achieving a high efficiency above 15% which, however, did not manifest the excellent charge transport properties of OTPs. An analogy of OTPs to traditional semiconductors was drawn after the demonstration of highly efficient planar heterojunction structure OTP devices and the observation of their excellent bipolar transport properties with a large diffusion length exceeding 100nm in CH3NH3PbI3 (MAPbI3) polycrystalline thin films. This review aims to provide the most recent advances in the understanding of the origin of the high OTP device efficiency. Specifically, we will focus on reviewing the progress in understanding (1) the characterization of fantastic optoelectronic property of OTPs, (2) the unusual defect physics that originate the optoelectron...
Source: Materials Science and Engineering: R: Reports - Category: Materials Science Source Type: research