光电流
离解(化学)
有机太阳能电池
接受者
异质结
材料科学
光化学
能量转换效率
光电子学
化学
化学物理
聚合物
物理化学
物理
复合材料
凝聚态物理
作者
Jolanda Simone Müller,Marc Comí,Flurin Eisner,Mohammed Azzouzi,D. E. Ruiz,Jun Yan,Salahuddin Attar,Mohammed Al‐Hashimi,Jun Yan
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2023-07-14
卷期号:8 (8): 3387-3397
被引量:5
标识
DOI:10.1021/acsenergylett.3c00943
摘要
We investigate the charge-generation processes limiting the performance of low-offset organic bulk-heterojunction solar cells by studying a series of newly synthesized PBDB-T-derivative donor polymers whose ionisation energy (IE) is tuned via functional group (difluorination or cyanation) and backbone (thiophene or selenophene bridge) modifications. When blended with the acceptor Y6, the series present heterojunction donor-acceptor IE offsets (ΔEIE) ranging from 0.22 to 0.59 eV. As expected, small ΔEIE decrease nonradiative voltage losses but severely suppresses photocurrent generation. We explore the origin of this reduced charge-generation efficiency at low ΔEIE through a combination of opto-electronic and spectroscopic measurements and molecular and device-level modeling. We find that, in addition to the expected decrease in local exciton dissociation efficiency, reducing ΔEIE also strongly reduces the charge transfer (CT) state dissociation efficiency, demonstrating that poor CT-state dissociation can limit the performance of low-offset heterojunction solar cells.
科研通智能强力驱动
Strongly Powered by AbleSci AI