Nature Energy | |
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년도 | 2019 |
학술지명 | Nature Energy |
논문명 | Efficient hybrid colloidal quantum dot/organic solar cells mediated by near-infrared sensitizing small molecules |
게재권/집 | 11/4 |
수록페이지 | 969 |
저자명 | Se-Woong Baek†, Sunhong Jun†, Byeongsu Kim†, Andrew H. Proppe†, Olivier Ouellette, Oleksandr Voznyy, Changjo Kim, Junho Kim, Grant Walters, Jung Hoon Song, Sohee Jeong, Hye Ryung Byun, Mun Seok Jeong, Sjoerd Hoogland, Jung-Yong Lee*, and Edward H. Sargent |
Link |
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Abstract Solution-processed semiconductors are promising materials to realize optoelectronic devices that combine high performance with inexpensive manufacturing. In particular, the exploitation of colloidal quantum dots (CQDs) capable of harvesting infrared photons, in conjunction with visible-absorbing organic chromophores, has been demonstrated as an interesting route. Unfortunately, CQD/organic hybrid photovoltaics have been limited to power conversion efficiencies (PCEs) below 10% due to chemical mismatch and difficulties in facilitating charge collection. Here we devise a hybrid architecture that overcomes these limitations by introducing small molecules into the CQD/organic stacked structure. The small molecule complements CQD absorption and creates an exciton cascade with the host polymer, thus enabling efficient energy transfer and also promoting exciton dissociation at heterointerfaces. The resulting hybrid solar cells exhibit PCEs of 13.1% and retain over 80% of their initial PCE after 150 h of continuous operation unencapsulated, outperforming present air-processed solution-cast CQD/organic photovoltaics. |