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Cr incorporation in Cu G a S 2 chalcopyrite: A new intermediate‐band photovoltaic material with wide‐spectrum solar absorption
Author(s) -
Chen Ping,
Qin Mingsheng,
Chen Haijie,
Yang Chongying,
Wang Yaoming,
Huang Fuqiang
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228721
Subject(s) - dopant , x ray photoelectron spectroscopy , absorption (acoustics) , absorption spectroscopy , chalcopyrite , materials science , analytical chemistry (journal) , solar cell , semiconductor , doping , chemistry , optoelectronics , physics , optics , nuclear magnetic resonance , copper , chromatography , metallurgy , composite material
Abstract An intermediate‐band (IB) semiconductor CuGa 1− x Cr x S 2 was investigated by the self‐consistent many‐body GW approach (sc GW ) and further confirmed by the experimental results. The Cr dopant introduced a partially occupied IB, and the density‐of‐states analysis indicates the electron transfer between the impurities and host lattice would suppress the non‐radiative recombination. The CuGa 1− x Cr x S 2 was synthesized by a high‐temperature solid‐state reaction and the X‐ray photoelectron spectroscopy (XPS) indicated the presence of Cr 3+ . Due to the Cr dopant, two additional absorption responses were directly observed in the UV–Vis–NIR absorption spectrum. The further photocatalytic investigations verified the IB absorptions could produce highly mobile electrons and holes to degrade dyes. This material leads to lower‐energy photon absorption, which could be a promising candidate for the high‐efficiency solar cells.