Journal
ADVANCED ENERGY MATERIALS
Volume 10, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902898
Keywords
crystallization energy; layer-specific annealing; perovskites; solar cells; UV LED
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Funding
- National Science Foundation (NSF) [ECCS-1151140]
- Center for Materials for Information Technology at the University of Alabama
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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/MAPbI(3)/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.
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