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Sustainable p-type copper selenide solar material with ultra-large absorption coefficient.


ABSTRACT: Earth-abundant solar absorber materials with large optical absorption coefficients in the visible enable the fabrication of low-cost high-efficiency single and multi-junction thin-film solar cells. Here, we report a new p-type semiconductor, Cu4TiSe4 (CTSe), featuring indirect (1.15 eV) and direct (1.34 eV) band gaps in the optimal range for solar absorber materials. CTSe crystallizes in a new noncentrosymmetric cubic structure (space group F4[combining macron]3c) in which CuSe4 tetrahedra share edges and corners to form octahedral anionic clusters, [Cu4Se4]4-, which in turn share corners to build the three-dimensional framework, with Ti4+ ions located at tetrahedral interstices within the channels. The unique crystal structure and the Ti 3d orbital character of the conduction band of CTSe give rise to near-optimal band gap values and ultra-large absorption coefficients (larger than 105 cm-1) throughout the visible range, which are promising for scalable low-cost high-efficiency CTSe-based thin-film solar cells.

SUBMITTER: Chen EM 

PROVIDER: S-EPMC6009434 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Sustainable p-type copper selenide solar material with ultra-large absorption coefficient.

Chen Erica M EM   Williams Logan L   Olvera Alan A   Zhang Cheng C   Zhang Mingfei M   Shi Guangsha G   Heron John T JT   Qi Liang L   Guo L Jay LJ   Kioupakis Emmanouil E   Poudeu Pierre F P PFP  

Chemical science 20180515 24


Earth-abundant solar absorber materials with large optical absorption coefficients in the visible enable the fabrication of low-cost high-efficiency single and multi-junction thin-film solar cells. Here, we report a new p-type semiconductor, Cu<sub>4</sub>TiSe<sub>4</sub> (CTSe), featuring indirect (1.15 eV) and direct (1.34 eV) band gaps in the optimal range for solar absorber materials. CTSe crystallizes in a new noncentrosymmetric cubic structure (space group <i>F</i>4[combining macron]3<i>c<  ...[more]

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