Lee Jihyung, Kim Byeongsu, Kim Changjo, Lee Min-Ho, Kozakci Irem, Cho Sungjun, Kim Beomil, Lee Sang Yeon, Kim Junho, Oh Jihun, Lee Jung-Yong
School of Electrical Engineering (EE), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
Information and Electronics Research Institute, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Aug 23;15(33):39408-39416. doi: 10.1021/acsami.3c08419. Epub 2023 Aug 9.
Hybrid colloidal quantum dot (CQD)/organic architectures are promising candidates for emerging optoelectronic devices having high performance and inexpensive fabrication. For unlocking the potential of CQD/organic hybrid devices, enhancing charge extraction properties at electron transport layer (ETL)/CQD interfaces is crucial. Hence, we carefully adjust the interface properties between the ETL and CQD layer by incorporating an interfacial layer for the ETL (EIL) using several types of cinnamic acid ligands. The EIL having a cascading band offset () between the ETL and CQD layer suppresses the potential barrier and the local charge accumulation at ETL/CQD interfaces, thereby reducing the bimolecular recombination. An optimal EIL effectively expands the depletion region that facilitates charge extraction between the ETL and CQD layer while preventing the formation of shallow traps. Representative devices with an EIL exhibit a maximum power conversion efficiency of 14.01% and retain over 80% of initial performances after 300 h under continuous maximum power point operation.
混合胶体量子点（CQD）/有机结构是具有高性能和低成本制造的新兴光电器件的有前途的候选材料。为了释放CQD/有机混合器件的潜力，增强电子传输层（ETL）/CQD界面处的电荷提取特性至关重要。因此，我们通过使用几种类型的肉桂酸配体为ETL引入界面层（EIL）来仔细调整ETL和CQD层之间的界面特性。在ETL和CQD层之间具有级联能带偏移（）的EIL抑制了ETL/CQD界面处的势垒和局部电荷积累，从而减少了双分子复合。最佳的EIL有效地扩展了耗尽区，这有利于ETL和CQD层之间的电荷提取，同时防止浅陷阱的形成。具有EIL的代表性器件在连续最大功率点操作下300小时后表现出14.01%的最大功率转换效率，并保留了超过80%的初始性能。
