【摘 要】
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The stability of perovskite solar cells is an important issue to be addressed for future applications.Perovskite solar cells are vulnerable to exposure to UV light due to promoted chemical reactions.However,preventing UV light from entering solar cells lo
【机 构】
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School of Physical Science and Technology,Jiangsu Key Laboratory of Thin Films,Soochow University,Su
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The stability of perovskite solar cells is an important issue to be addressed for future applications.Perovskite solar cells are vulnerable to exposure to UV light due to promoted chemical reactions.However,preventing UV light from entering solar cells lowers the power conversion efficiency by reduc-ing the photocurrent.The challenge is to improve UV stability without sacrificing efficiency.Here,we demonstrate the reduction of UV light-related negative effects from the perspective of spectral modifica-tion.By simultaneously introducing UV-visible downshifting and light trapping,perovskite solar cells can achieve a comparable efficiency of over 21％to that of an unmodified device.The optimized device obtains increased UV stability due to UV-visible downshifting.Different from other strategies,spectral modification externally alters the composition of incident light and improves UV stability without chang-ing the internal device architecture,which is broadly applicable to perovskite solar cells with different structures.The present work may also find applications in other types of solar cells to boost the stability of devices exposed to UV light.
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