Abstract
Perovskite solar cells, in which decaphenylcyclopentasilane (DPPS) layers were formed on the surface of a CH3NH3PbI3-based perovskite layer, were developed. The photovoltaic properties were improved by controlling the annealing temperature of the perovskite layer. For perovskite layers annealed at high temperatures in the range of 180–220 °C, the perovskite crystals were densely formed and the surface coverage of the perovskite layer was improved. The DPPS-laminated devices suppressed the formation of PbI2 crystals, and the stability was improved by the DPPS layer. Furthermore, the conversion efficiencies were improved over extended periods of time.
Highlights
The most commonly used solar cells are currently silicon-based solar cells
Recently developed CH3NH3PbI3 (MAPbI3)-based perovskite compounds have demonstrated numerous advantages, such as direct bandgaps, easy fabrication process, and high conversion efficiencies [1,2]. These compounds are considered as major candidates for next-generation solar cell materials. These lead halide compounds are typically unstable in air, and the stability of the corresponding perovskite photovoltaic devices should be improved for inclusion in the actual cell module
For the device prepared at 180 °C, the conversion efficiency was observed at 1.67%
Summary
The most commonly used solar cells are currently silicon-based solar cells. Recently developed CH3NH3PbI3 (MAPbI3)-based perovskite compounds have demonstrated numerous advantages, such as direct bandgaps, easy fabrication process, and high conversion efficiencies [1,2]. These compounds are considered as major candidates for next-generation solar cell materials. These lead halide compounds are typically unstable in air, and the stability of the corresponding perovskite photovoltaic devices should be improved for inclusion in the actual cell module. The instability of the perovskite photovoltaic devices results from the migration of CH3NH3 (MA) and iodine (I), and reactivity with H2O [3,4]
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