激子
有机太阳能电池
库仑
有机半导体
化学物理
非平衡态热力学
离解(化学)
半导体
电子
材料科学
载流子
电介质
比克西顿
混合太阳能电池
熵(时间箭头)
光诱导电荷分离
凝聚态物理
化学
物理
光电子学
热力学
物理化学
量子力学
聚合物
人工光合作用
光催化
复合材料
催化作用
生物化学
作者
Yangjun Yan,Yajie Zhang,Waqar Ali Memon,Mengni Wang,Xinghua Zhang,Zhixiang Wei
标识
DOI:10.1002/marc.202100903
摘要
Abstract In organic solar cells (OSCs), the lower dielectric constant of organic semiconductor material induces a strong Coulomb attraction between electron–hole pairs, which leads to a low exciton separation efficiency, especially the charge transfer (CT) state. The CT state formed at the electron‐donor (D) and electron‐acceptor (A) interface is regarded as an unfavorable property of organic photovoltaic devices. Since the OSC works in a nonzero temperature condition, the entropy effect would be one of the main reasons to overcome the Coulomb energy barrier and must be taken into account. In this review, the present understanding of the entropy‐driven charge separation is reviewed and how factors such as the dimensionality of the organic semiconductor, energy disorder effect, the morphology of the active layer, are described, as well as how the nonequilibrium effect affects the entropy contribution in compensating the Coulomb dissociation barrier for CT exciton separation and charge generation process. The investigation of the entropy effect on exciton dissociation mechanism from both theoretical and experimental aspects is focused on, which provides pathways for understanding the underlying mechanisms of exciton separation and further enhancing the efficiency of OSCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI