The use of polymer solar cells (PSCs) for indoor dim-light energy harvesting has attracted significant interest for low power consumption electronics such as the Internet of Things. However, the photostability study and degradation mechanism under indoor artificial light is far behind than those under full sun illumination (standard AM 1.5G), which is crucial for the successful commercialization of indoor PSCs. Herein, the operational lifetime and photodegradation mechanism of PTB7-Th:PC70BM-based inverted PSCs degraded under standard AM 1.5G and 1000 lux LED 2700K light sources were compared. A high power conversion efficiency (PCE) of up to 16.19% and a long operational lifetime (T80) of 3060 min were achieved by LED-irradiated devices, higher and more stable than that of AM 1.5G-irradiated devices with PCE of 9.98% and T80 of only 260 min. Using impedance spectroscopy and three resistive-capacitive equivalent circuit model, we were able to identify the most suffered layer. Our results demonstrate that PSCs have potential practical applications as high performance and a high stable indoor power source.

中文翻译：

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通过阻抗光谱法研究 AM 1.5G 和 LED 照明下的倒置聚合物太阳能电池的光稳定性


使用聚合物太阳能电池（PSC）进行室内微光能量收集引起了物联网等低功耗电子产品的极大兴趣。然而，室内人造光下的光稳定性研究和降解机制远远落后于全日光照射下（标准AM 1.5G），这对于室内PSC的成功商业化至关重要。在此，比较了基于 PTB7-Th:PC70BM 的倒置 PSC 在标准 AM 1.5G 和 1000 lux LED 2700K 光源下降解的使用寿命和光降解机制。 LED照射器件实现了高达16.19%的高功率转换效率（PCE）和3060分钟的长使用寿命（T80），比AM 1.5G照射器件的PCE 9.98%更高、更稳定而T80仅需260分钟。使用阻抗谱和三个电阻电容等效电路模型，我们能够识别受影响最严重的层。我们的结果表明，PSC 作为高性能和高稳定的室内电源具有潜在的实际应用。