Spectral Dependence of Degradation under Ultraviolet Light in Perovskite Solar Cells
Spectral Dependence of Degradation under Ultraviolet Light in Perovskite Solar Cells
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DOI：
10.1021/acsami.8b03024
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发表时间：
2018-07-04
影响因子：
9.5
通讯作者：
Paetzold, Ulrich W.
中科院分区：
文献类型：
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作者：
Farooq, Amjad;Hossain, Ihteaz M.;Paetzold, Ulrich W.
永磁太阳能电池（PSC）表现出优异的功率转换效率（PCE），但面临严峻的稳定性挑战。一个关键的降解机制是暴露于紫外线（UV）光。然而，不同紫外线波段的影响尚未得到很好的确定。在这里，我们系统地研究了基于甲基铵碘化铅（CH 3 NH3 PbI 3）吸收剂的PSC在加速条件下暴露于（i）310-317（UV-B范围）和（ii）360-380 nm（UV-A范围）的稳定性。我们证明了所研究的UV-B波段对PSC的稳定性是有害的，在>1700日照小时的暴露期后导致PCE降解超过50%。这一发现是有效的架构与一系列的电子传输层，包括二氧化锡，致密二氧化钛，电子束二氧化钛，和纳米粒子二氧化钛。我们还表明，光降解是明显的高，以及低光照强度的UV-B光，但不是与UV-A波长的照明。最后，我们表明，通过使用紫外线过滤或发光降频层，可以以一小部分光电流为代价防止PSC的退化。
Perovskite solar cells (PSCs) demonstrate excellent power conversion efficiencies (PCEs) but face severe stability challenges. One key degradation mechanism is exposure to ultraviolet (UV) light. However, the impact of different UV bands is not yet well established. Here, we systematically study the stability of PSCs on the basis of a methylammonium lead iodide (CH3NH3PbI3) absorber exposed to (i) 310-317 (UV-B range) and (ii) 360-380 nm (UV-A range), under accelerated conditions. We demonstrate that the investigated UV-B band is detrimental to the stability of PSCs, resulting in PCE degradation by more than 50% after an exposure period >1700 sun-hours. This finding is valid for architectures with a range of electron transport layers, including SnO2, compact-TiO2, electron-beam TiO2, and nanoparticle-TiO2. We also show that photodegradation is apparent for high, as well as for low illumination intensities of UV-B light, but not for illumination with UV-A wavelengths. Finally, we show that degradation of PSCs is preventable at the cost of a small fraction of photocurrent by using UV-filtering or luminescent downshifting layers.