Monodisperse Perovskite Colloidal Quantum Dots Enable High-Efficiency Photovoltaics
- Authors
- Lim, Seyeong; Lee, Gyudong; Han, Sanghun; Kim, Jigeon; Yun, Sunhee; Lim, Jongchul; Pu, Yong-Jin; Ko, Min Jae; Park, Taiho; Choi, Jongmin; Kim, Younghoon
- Issue Date
- Jun-2021
- Publisher
- American Chemical Society
- Citation
- ACS Energy Letters, v.6, no.6, pp.2229 - 2237
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Energy Letters
- Volume
- 6
- Number
- 6
- Start Page
- 2229
- End Page
- 2237
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1038
- DOI
- 10.1021/acsenergylett.1c00462
- ISSN
- 2380-8195
- Abstract
- Bandtail broadening originating from increasing the polydispersity of colloidal quantum dots (CQDs) deteriorates open-circuit voltage (VOC) and hinders charge-carrier transport in CQD photovoltaics. The development of colloidal synthetic routes has enabled preparing monodisperse perovskite CQDs (Pe-CQDs) that have attracted attention as promising absorbers in CQD photovoltaics. However, polar-antisolvent-based purification induces the dissolution and agglomeration of Pe-CQDs, resulting in an irregular size distribution. Consequently, the photovoltaic performance decreases because of the increase in Pe-CQD polydispersity. Here, we demonstrate the preparation of well-purified monodisperse CsPbI3-Pe-CQDs via size selection on the basis of gel permeation chromatography. Well-purified monodisperse Pe-CQDs exhibit improved photovoltaic performance and achieve a low Pe-CQD polydispersity. Furthermore, these Pe-CQDs show higher photoluminescence quantum yields, narrower full-widths at half-maximum, and lower Urbach energies, in comparison to irregular-sized Pe-CQDs without size selection. Therefore, CsPbI3-Pe-CQD solar cells comprising monodisperse Pe-CQDs show the highest power conversion efficiency (15.3%) and VOC (1.27 V) among the fully inorganic CsPbI3-Pe-CQD solar cells reported so far.
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