Gradient formation and charge carrier dynamics of CuBiI4 based perovskite-like solar cells. Issue 6 (2nd April 2020)

• Record Type: Journal Article
• Authors: Yu, Haili; Zhang, Busheng; Qi, Ruijuan; Qu, Nannan; Zhao, Chaoliang; Lei, Yan; Yang, Xiaogang; Zheng, Zhi
• Is Part Of: Sustainable energy & fuels. Volume 4:Issue 6(2020)
• Page Start: 2800
• Page End: 2807
• Publication Date: 2020-04-02
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/c9se01288e
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : The formation of a Bi gradient with a Bi/Cu bilayer as the precursor can improve the photoinduced charge carrier transportation in CuBiI4 films. Abstract : Designing lead-free inorganic perovskite or perovskite-like structure materials and researching the corresponding photoinduced charge carrier dynamics are always promising due to both the environment and power conversion efficiency considerations. In this work, we intelligently employ a bilayer metal Bi/Cu thin film with different atomic ratios as the precursor to fabricate a CuBiI4 perovskite-like film in situ with a controlled Bi gradient at room temperature. This structure can significantly affect the photoinduced charge carrier dynamics of the resulting products. Next, a series of transient surface photovoltage (TSPV) measurements are carried out to investigate the photoinduced charge carrier dynamics of such CuBiI4 and CuBiI4 :organic hybrid thin films. The results reveal that the gradually decreasing Bi content from ITO to CuBiI4 can facilitate the photoinduced charge carrier transportation. Finally, a champion PCE of 1.10% is obtained for an ITO/CuBiI4 :polythieno[3, 4- b ]-thiophene- co -benzodithiophene (PTB7)/Au solar cell device. In particular, we find an exact negative correlation of the defined parameter L (the defined value for evaluating the photoinduced charge carrier dynamics in TSPV measurements) with the corresponding PCE of various devices for the first time, which may pave a new way for evaluating the potential photoelectric and photovoltaic performances of new materials without the assembly of solar cell devices.