Effect of high-temperature post-deposition annealing on cesium lead bromide thin films deposited by vacuum evaporation

Ayuki Murata,Ryousuke Ishikawa,Hirofumi Shimizu,Shinsuke Miyajima,Yuta Shiratori,Tatsuya Nishimura,Takuya Kato

doi:10.1063/1.5139553

Abstract

The effects of high-temperature (500 °C) post-deposition annealing (PDA) on the properties of cesium lead bromide (CsPbBr3) films deposited by vacuum evaporation were studied. The PDA effectively improved the grain size of the CsPbBr3 films. This improvement of the grain size leads to the improvement of carrier diffusion length from 0.1 µm to 0.5 μm. A CsPbBr3 solar cell fabricated using a CsPbBr3 layer with PDA at 500 °C for 60 min showed a conversion efficiency of 6.62% (VOC = 1.465 V, JSC = 6.57 mA/cm2, and FF = 0.688). Our CsPbB3 solar cell also showed a conversion efficiency of 22.5% (VOC = 1.502 V, JSC = 53.7 mA/cm2, and FF = 0.574) for blue LED light (peak wavelength of 453 nm) with an intensity of 206 mW/cm2.

Highlights

Optical wireless power transmission (OWPT) is one of the wireless power transmission techniques that uses a light source and an optical power converter.1 Semiconductor lasers or light emitting diodes (LEDs) are used for the light source, and solar cells are used for the optical power converter.2 In this application, the efficiency of the OWPT system is mainly determined by the product of the conversion efficiency of the light source and the conversion efficiency of the optical power converter
We investigated the effect of high temperature postdeposition annealing (PDA) on the properties of CsPbBr3 films deposited by the thermal evaporation method
We investigated the effect of high-temperature (500 ○C) post-deposition annealing (PDA) on the properties of CsPbBr3 thin films prepared by sequential PbBr2 and cesium bromide (CsBr) evaporation

Summary

Introduction

Optical wireless power transmission (OWPT) is one of the wireless power transmission techniques that uses a light source and an optical power converter. Semiconductor lasers or light emitting diodes (LEDs) are used for the light source, and solar cells are used for the optical power converter. In this application, the efficiency of the OWPT system is mainly determined by the product of the conversion efficiency of the light source and the conversion efficiency of the optical power converter. Semiconductor lasers or light emitting diodes (LEDs) are used for the light source, and solar cells are used for the optical power converter.. The development of a high efficiency solar cell for monochromatic light is important. For widegap optical power converters, it is important to use short-wavelength monochromatic light. The wallplug efficiency of blue lasers is limited to be about 40% at present, but scitation.org/journal/adv there is room for improvement of the efficiency.. The wallplug efficiency of blue lasers is limited to be about 40% at present, but scitation.org/journal/adv there is room for improvement of the efficiency.6 This suggests that blue LEDs and lasers are some of the good candidates for the light source of OWPT. It is important to develop an optical power converter using a wide bandgap material for a high efficiency

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