Nanoscale Photo-Absorbing Kesterite Grown on Anatase Mesoscopic Films by Sequential Binary Chalcogenide Solution Deposition-Exchange, Annealing, and Etching

作者：Wang Zhuoran; Demopoulos George P^*

来源：Crystal Growth & Design, 2016, 16(7): 3618-3630.

DOI：10.1021/acs.cgd.6b00033

Cu2ZnSnS4 (CZTS) with kesterite crystal structure is considered a promising semiconductor material for photovoltaics due to its excellent optical properties and nontoxic, earth-abundant components. In this work, the nanoscale coating of CZTS on anatase mesoscopic films is studied to build an absorber (kesterite)-conductor (anatase) photoanode structure with high composition uniformity a challenge for complex absorbers like quaternary CZTS. To this end, we first develop a three-step binary chalcogenide solution deposition-exchange sequence for precursor preparation that is followed by in-depth analysis of the deposit-forming chemical reactions and characterization of elemental distribution and composition control. Then, crystallization is induced by annealing at 500 degrees C for 1 h, followed by an additional hydrochloric acid etching step to remove secondary binary phases and surface imperfections leading to improved composition of a CZTS/TiO2 film as a candidate for use in kesterite-sensitized solar cells.

• 出版日期2016-7
• 单位McGill