Methylammonium Lead Bromide Perovskite-Based Solar Cells by Vapor-Assisted Deposition

Abstract

The past two years have seen the uniquely rapid emergence of a new class of solar cell based on organic–inorganic halide perovskite. Although less explored than its tri-iodide counterparts, CH3NH3PbBr3 has a larger bandgap of 2.3 eV with a higher voltage potential that is suitable for tandem solar cell applications. In this paper, we report a vapor-assisted method for depositing and fully crystallizing CH3NH3PbBr3 film on mesoporous TiO2 with good coverage. CH3NH3PbBr3 fabricated using this method has demonstrated long carrier diffusion length (>1 μm) as estimated by transient photoluminescence-quenching measurements. We demonstrate solar cells fabricated using such films and spiro-OMeTAD as the hole transport layer with an averaged (from forward and reverse scans) conversion efficiency of 8.7%, V oc of 1.45 V, J sc of 9.75 mA/cm2, and fill factor of 61.5%.

Research Update: Hybrid organic-inorganic perovskite (HOIP) thin films and solar cells by vapor phase reaction

“…The bromide-based HOIP solar cells delivered a high open-circuit voltage of 1.45 V because of its wide bandgap. 32 The photoluminescence results showed longer diffusion length for CH 3 NH 3 PbBr 3 films, indicating better crystallinity. Subsequently, the processing environment for the gas-solid perovskite crystallization was further modified from a close container to a tubular furnace.…”

Cadmium-doped flexible perovskite solar cells with a low-cost and low-temperature-processed CdS electron transport layer

“…10 A variety of methods including solution processing, 11,12 vacuum deposition [13][14][15][16] and vapor-assisted solution processing, [17][18][19] HCVD, 20 HPCVD, 21,22 LPVASP 23 etc. have been applied to fabricate perovskite lms.…”

Light-Induced Increase of Electron Diffusion Length in a p–n Junction Type CH3NH3PbBr3 Perovskite Solar Cell

“…[7][8][9] The demonstrated power conversion efficiencies reach values of 9%, with V oc as high as 1.5 V and short-circuit current density, j sc , as high as 9 mA/cm 2 (approaching the theoretical maximum). 1,2 Similar to the structure of MAPbI 3 solar cells Br-perovskite layers are stacked between a hole blocking layer, commonly TiO 2 , and a hole-transport layer (HTL). For MAPbI 3 2,2'7,7'-tetrakis-(N,N-di-p-methoxyphenyl amine)-9,9'-spirobifluorene is commonly used as HTL, whereas in this work 4,4'-bis(N-carbazolyl)-1 ,1' -bisphenyl (CBP) was used for high V OC MAPbBr 3 cells.…”