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Synthesis and Characterization of Photoelectrochemical and Photovoltaic Cu2BaSnS4 Thin Films and Solar Cells

Abstract

Earth−abundant Copper−Barium−Thiostannate Cu2BaSnS4 (CBTS)−based thin films have recently been reported to exhibit the optoelectronic and defect properties suitable as absorbers for photoelectrochemical (PEC) water splitting and the top cell of tandem photovoltaic (PV) solar cells. In this work, we synthesis CBTS thin films from different Cu compositions in precursor and find that the Cu composition of the precursor can influence on the phase formation and structural preferred orientation in the resultant CBTS. The single−phase and device-grade CBTS film can be prepared using the precursor with a slightly Cu poor content of Cu/(Ba+Sn)=0.95 and Cu/Ba=1.81. We also find that CBTS demonstrates an intrinsic copper poor composition leading to a p−type conductivity. The PEC water reduction device with a configuration fluorine−doped SnO2/CBTS/Pt/electrolyte (pH~7) is able to generate a cathodic photocurrent of 3.9 mA•cm−2 at 0 VRHE under the illumination of a 300 W xenon lamp. The PV solar device with a structure fluorine−doped SnO2/CBTS/CdS/ZnO/aluminum−doped ZnO is suffering from a severe recombination issue at the heterointerface which greatly limits the overall device performance, evidenced by detailed characterizations using capacitance-voltage and impedance spectroscopy tested with various alternating-current frequencies, temperatures, and applied direct-current biases. As a consequence, the best PV device only delivers a 1.6% conversion efficiency under AM 1.5 illumination.

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Publication details

The article was received on 17 Apr 2017, accepted on 14 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TC01678F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Synthesis and Characterization of Photoelectrochemical and Photovoltaic Cu2BaSnS4 Thin Films and Solar Cells

    J. Ge and Y. Yan, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01678F

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