5 years ago

Long-Lasting Nanophosphors Applied to UV-Resistant and Energy Storage Perovskite Solar Cells

Long-Lasting Nanophosphors Applied to UV-Resistant and Energy Storage Perovskite Solar Cells
Dali Liu, Yu Cheng, Hao Li, Yan Zheng, Hongwei Song, Lin Xu, Xu Chen, Junjie Jin, Cong Chen, Qilin Dai
Recently, considerable progress is achieved in lab prototype perovskite solar cells (PSCs); however, the stability of outdoor applications of PSCs remains a challenge due to the high sensitivity of perovskite material under moist and ultraviolet (UV) light conditions. In this work, the UV photostability of PSC devices is improved by incorporating a photon downshifting layer—SrAl2O4: Eu2+, Dy3+ (SAED)—prepared using the pulsed laser deposition approach. Light-induced deep trap states in the photoactive layer are depressed, and UV light-induced device degradation is inhibited after the SAED modification. Optimized power conversion efficiency (PCE) of 17.8% is obtained through the enhanced light harvesting and reduced carrier recombination provided by SAED. More importantly, a solar energy storage effect due to the long-persistent luminescence of SAED is obtained after light illumination is turned off. The introduction of downconverting material with long-persistent luminescence in PSCs not only represents a new strategy to improve PCE and light stability by photoconversion from UV to visible light but also provides a new paradigm for solar energy storage. A long persistent photon downshifting layer – SrAl2O4: Eu2+, Dy3+– is successfully incorporated into perovskite solar cells by the pulsed laser deposition approach to improve device performance. Optimized power conversion efficiency of 17.8% is obtained due to enhanced light harvesting and reduced carrier recombination. Furthermore, light-induced deep trap states are depressed and solar energy storage effect is obtained after illumination is turned off.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700758

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