Rapid Layer‐Specific Annealing Enabled by Ultraviolet LED with Estimation of Crystallization Energy for High‐Performance Perovskite Solar Cells

Abstract

A rapid layer‐specific annealing on perovskite active layer enabled by ultraviolet (UV) light‐emitting diode (LED) is demonstrated and efficiency close to 19% is achieved in a simple planar inverted structure ITO/PEDOT:PSS/MAPbI3/PC71BM/Al without any device engineering. These results demonstrate that if the UV dosage is well managed, UV light is capable of annealing perovskite into high‐quality film rather than simply damaging it. Different in principle from other photonic treatment techniques that can heat up and damage underlying films, the UV‐LED‐annealing method enables layer‐specific annealing because LED light source is able to provide a specific UV wavelength for maximum light absorption of target film. Moreover, the layer‐specific photonic treatment allows accurate estimation of the crystallization energy required to form perovskite film at device quality level.

Novel photoelectric material of perovskite-like (CH3)3SPbI3 nanorod arrays with high stability

“…Organometallic halide perovskite materials have been distinguished in various optoelectronic fields, such as solar cells [1,2], optical detectors [3], light-emitting diodes [4], and laser [5]. These materials possess excellent optoelectronic properties of suitable direct bandgap, broad absorption range, bipolar charge mobility and long carrier diffusion length [6,7].…”

Effects of Photonic Curing Processing Conditions on MAPbI3 Film Properties and Solar Cell Performance

“…Recently, photo-irradiation methods including near-infrared radiation, flash infrared annealing, laser annealing, , and ultraviolet light were investigated to replace TA in PSC fabrication because of their fast processing speed and low energy consumption. These studies successfully reduce the processing time of the perovskite active layer from tens of minutes for TA to 2–20 s. However, to further reduce capital cost and increase processing speed, a much faster conversion method is needed.…”

Annealing Engineering in the Growth of Perovskite Grains

“…However, utilizing the high absorption of perovskite in the UV band appropriately can promote crystallization. Li et al applied a 365 nm UV light emitting diode (LED) to achieve the accurate annealing of the perovskite layer by controlled UV light irradiation [104], which significantly eliminated the hysteresis effect and obtained a device with an efficiency of 19%. UV light can be annealed by controlling the amount of irradiation.…”