Anti-solvent dependent device performance in CH3NH3PbI3 solar cells: the role of intermediate phase content in the as-prepared thin films. Issue 5 (10th May 2017)

• Record Type: Journal Article
• Authors: Li, Yang; Wang, Jianan; Yuan, Yi; Dong, Xiandui; Wang, Peng
• Is Part Of: Sustainable energy & fuels. Volume 1:Issue 5(2017)
• Page Start: 1041
• Page End: 1048
• Publication Date: 2017-05-10
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/c7se00125h
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : Our work highlights the intrinsic role of an intermediate phase in controlling the film quality of a solution processed organic–inorganic hybrid CH3 NH3 PbI3 . Abstract : For high-performance perovskite solar cells, one-step solution deposition with anti-solvent washing is reported as an excellent processing method. In this paper, we employ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), to quantitatively evaluate the relative contents of an intermediate phase in the as-prepared films, altered by anti-solvents, i.e. dichloromethane (DCM), toluene (TL), and diethyl ether (DE). Based on the joint measurements of scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL), femtosecond transient absorption (fs-TA), current–voltage ( J – V ), and impedance spectroscopy, we reveal that a high content of the intermediate phase endowed with the anti-solvent DE is beneficial to film quality and device efficiency. A high coverage and pin-hole free CH3 NH3 PbI3 film with a long PL lifetime attained via DE washing is utilized to fabricate a CH3 NH3 PbI3 solar cell exhibiting over 17% power conversion efficiency. It is found that the formation of a high content intermediate phase in the as-prepared thin film is crucial to finally produce a dense and compact perovskite film with the aid of thermal annealing.