Color-temperature dependence of indoor organic photovoltaic performance
Color-temperature dependence of indoor organic photovoltaic performance
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室内有机光伏性能的色温依赖性
DOI：
10.1016/j.orgel.2022.106477
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发表时间：
2022
影响因子：
3.2
通讯作者：
Hsu, Julia W.P.
中科院分区：
文献类型：
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作者：
Zhang, Boya;Bonner, Justin C.;Murthy, Lakshmi N.S.;Nguyen, Thien A.;Cao, Fong-Yi;Cheng, Yen-Ju;Hamadani, Behrang H.;Hsu, Julia W.P.
有机材料特别适合于室内光能收集，因为它们主要吸收可见光谱，并且不存在紫外线，从而最大限度地减少了它们的降解。然而，光伏器件在室内照明下的性能取决于光源的相关色温（CCT），但以前没有研究过。本文研究了在白色发光二极管（LED）照明下，不同给体和受体材料组合的有机光致变色材料。在3000 K、4000 K和6000 K的标称LED CCT下，在1000 lx的照度下进行电流密度-电压（J-V）测量。测量了纯膜和共混膜的吸收光谱和器件的外量子效率。研究结果表明，在3000 K到6000 K CCT范围内，蓝光LED发光区的有源层吸收决定了短路电流密度（Jsc）的增加;在450 nm处，有源层吸收越多，在较高CCT下Jsc增加越大。我们发现当CCT从3000 K变化到6000 K时，有源层在450 nm处的归一化吸收分数需要> 0.85以消除功率转换效率的降低。这项工作突出了有机吸收剂在无机材料中难以实现的独特可调性，并为如何在不同的室内照明条件下为特定应用选择有机吸收剂提供了指导。
Organic materials are uniquely suited for indoor light energy harvesting because they absorb mostly in the visible spectrum and the absence of ultraviolet light minimizes their degradation. However, the performance of photovoltaic devices under indoor lighting depends on the correlated color temperatures (CCTs) of the light sources but has not been examined previously. Here we study organic photovoltaics with different combinations of donor and acceptor materials under white light-emitting diode (LED) illumination. The current density – voltage (J - V) measurements were performed under illuminance of 1000 lx at nominal LED CCTs of 3000 K, 4000 K, and 6000 K. Absorption spectra of neat and blended films and device external quantum efficiency were measured. Our results show that active layer absorption in the blue LED emission region determines the short-circuit current density (Jsc) increase from 3000 K to 6000 K CCT; the more the active layer absorbs at 450 nm, the larger the Jscincrease under higher CCTs. We find that the normalized fractional absorption of the active layer at 450 nm needs to be > 0.85 to eliminate a decrease in power conversion efficiency as the CCT is varied from 3000 K to 6000 K. This work highlights the unique tunability of organic absorbers that is difficult to achieve in inorganic materials and provides guidance on how to select organic absorbers for specific applications under different indoor illumination conditions.