Revealing conflicting effects of solvent additives on morphology and performance of non-fullerene organic photovoltaics under different illuminance conditions
Revealing conflicting effects of solvent additives on morphology and performance of non-fullerene organic photovoltaics under different illuminance conditions
复制标题
DOI：
10.1016/j.dyepig.2022.110754
复制
发表时间：
2022-09
影响因子：
4.5
通讯作者：
Youngwoo Kwon;Chi-Hyeong Lee;M. Nam;Doo‐Hyun Ko
中科院分区：
文献类型：
--
作者：
Youngwoo Kwon;Chi-Hyeong Lee;M. Nam;Doo‐Hyun Ko
溶剂添加剂的使用对于控制非富勒烯本体异质结（BHJ）有机光致发光材料（OPV）在室内和室外条件下的形态和效率是有效的。在这项研究中，我们研究了溶剂添加剂对非富勒烯OPV的形态和光伏操作在不同的光照条件下的影响。溶剂添加剂（例如，1，8-二碘辛烷）改善了非富勒烯BHJ层中的分子堆积和电荷传输，提高了1个太阳光照下的功率转换效率（PCE）。然而，将溶剂添加剂促进形成的结晶诱导的粗糙表面和孤立的非富勒烯域中的混合区域。这些意想不到的形态特征增加了陷阱辅助电荷复合和泄漏电流的程度，显著降低了非富勒烯OPV在对应于室内照明的低光照水平下的PCE。了解溶剂添加剂的影响，启发我们进一步控制非富勒烯OPV的形态特征，通过微调溶剂添加剂的浓度超过全球公认的水平。这对于优化非富勒烯OPV的室内PCE（21.71%）是有效的，其超过了常规接受的参考（18.02%）。本研究为理解溶剂添加剂的关键作用和优化高性能室内OPV应用的非富勒烯BHJ的形态提供了指导。
The use of solvent additives is effective for controlling the morphology and efficiency of non-fullerene bulk-heterojunction (BHJ) organic photovoltaics (OPVs) under both indoor and outdoor conditions. In this study, we examined the effects of solvent additives on the morphology and photovoltaic operation of non-fullerene OPVs under different illuminance conditions. Solvent additives (e.g., 1,8-diiodooctane) improved molecular packing and charge transport in non-fullerene BHJ layers, increasing the power conversion efficiency (PCE) under 1-sun illumination. However, incorporating the solvent additives promoted the formation of a crystallization-induced roughened surface and an isolated-non-fullerene domain in the intermixing region. These unexpected morphological features increased the degree of trap-assisted charge recombination and leakage current, significantly reducing the PCE of non-fullerene OPVs at low light levels corresponding to indoor lighting. Understanding the effect of solvent additives inspires us to further control the morphological features of the non-fullerene OPVs by fine-tuning the solvent-additive concentration beyond the globally accepted level. This was effective for optimizing the indoor PCE of non-fullerene OPVs (21.71%), which exceeded that of the conventionally accepted reference (18.02%). This study provides guidelines for understanding the critical roles of solvent additives and optimizing the morphology of non-fullerene BHJs for high-performance indoor OPV applications.