Abstract
This paper presents a new type of solar cellwith enhanced optical-current characteristics using an ultra-thin CuIn1−xGaxSe2 hole-transporting material (HTM) layer (<400 nm). The HTM layer was between a bi-layer Mo metal-electrode and a CH3NH3PbI3 (MAPbI3) perovskite active absorbing material. It promoted carrier transportand led to an improved device with good ohmic-contacts. The solar cell was prepared as a bi-layer Mo/CuIn1−xGaxSe2/perovskite/C60/Ag multilayer of nano-structures on an FTO (fluorine-doped tin oxide) glass substrate. The ultra-thin CuIn1−xGaxSe2 HTM layers were annealed at various temperatures of 400, 500, and 600 °C. Scanning electron microscopy studies revealed that the nano-crystal grain size of CuIn1−xGaxSe2 increased with the annealing temperature. The solar cell results show an improved optical power conversion efficiency at ~14.2%. The application of the CuIn1−xGaxSe2 layer with the perovskite absorbing material could be used for designing solar cells with a reduced HTM thickness. The CuIn1−xGaxSe2 HTM has been evidenced to maintain a properopen circuit voltage, short-circuit current density and photovoltaic stability.
Highlights
Hybrid organic-inorganic perovskite materials exhibit the advantages of easy fabrication, a large absorption coefficient, an adjustable energy band gap, high carrier mobility, and a long charge carrier diffusion length [1,2,3,4]
It has been encouraging to investigate Cu-based inorganic HTMs with good characteristics, and ultra-thin CuIn1−x Gax Se2 can act as a new hole-transporting material in solar cells
The morphology of the CuIn1−x Gax Se2 HTM film was investigated by SEM
Summary
Hybrid organic-inorganic perovskite materials exhibit the advantages of easy fabrication, a large absorption coefficient, an adjustable energy band gap, high carrier mobility, and a long charge carrier diffusion length [1,2,3,4]. It has been encouraging to investigate Cu-based inorganic HTMs with good characteristics, and ultra-thin CuIn1−x Gax Se2 can act as a new hole-transporting material in solar cells.
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