材料科学
双层
异质结
聚合物太阳能电池
聚合物
载流子
光电子学
有机太阳能电池
超快激光光谱学
激子
接受者
纳米技术
能量转换效率
化学
光谱学
膜
生物化学
物理
量子力学
凝聚态物理
复合材料
作者
Tack Ho Lee,Won‐Woo Park,Song Yi Park,Shinuk Cho,Oh‐Hoon Kwon,Jin Young Kim
出处
期刊:Solar RRL
[Wiley]
日期:2021-06-04
卷期号:5 (8)
被引量:8
标识
DOI:10.1002/solr.202100326
摘要
Herein, planar heterojunctions comprising a nonfullerene small molecular acceptor (NFA) and a polymer donor are demonstrated by transferring polymer films on a water surface on top of NFA layers. So far, most solution‐processed layer‐by‐layer architectures have been reported as sequentially deposited bulk heterojunctions or pseudo‐bilayers because mixed regions at the donor/acceptor interface are inevitable in these methods. By virtue of the unique properties of conjugated polymers such as hydrophobicity and spontaneous film formation on a water surface, the fabrication of NFA/polymer bilayer nanostructures is clearly demonstrated by dramatically simplified methods. These bilayers are successfully rendered into bilayer organic solar cells achieving a power conversion efficiency of up to 7.47%. This reflects that these bilayers have appropriate morphological and optoelectrical properties to be operated as photoactive layers in photovoltaic devices. Further, ultrafast charge transfer from the polymer donor to the NFA and fast carrier mobility are investigated by transient‐absorption spectroscopy and photoinduced charge‐extraction measurements. Fast carrier dynamics are observed, which are essential for the efficient harvest of excitons in photovoltaic devices. It is believed that the formation of planar heterojunctions on water can offer technical diversity for the fabrication methods of the photovoltaic devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI