Impact of highly crystalline, isoindigo-based small-molecular additives for enhancing the performance of all-polymer solar cells
- Authors
- Cho, Han-Hee; Han, Gibok; Younts, Robert; Lee, Wonho; Gautam, Bhoj R.; Lee, Seungjin; Lee, Changyeon; Kim, Taesu; Kim, Felix Sunjoo; Gundogdu, Kenan; Kim, Bumjoon J.
- Issue Date
- Oct-2017
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.40, pp 21291 - 21299
- Pages
- 9
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 5
- Number
- 40
- Start Page
- 21291
- End Page
- 21299
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/3757
- DOI
- 10.1039/c7ta06939a
- ISSN
- 2050-7488
2050-7496
- Abstract
- We have developed a simple yet versatile approach for enhancing the performance of all-polymer solar cells (all-PSCs) using a highly crystalline small-molecular additive, 6,6 '-dithiopheneisoindigo (DTI). The DTI additive in a blend of PTB7-Th donor and P(NDI2HD-T) acceptor enhances the power conversion efficiency of all-PSCs from 5.9 to 6.8%. Based on the analyses of the electrical, optical, and structural properties of all-PSCs, it is suggested that DTI additives promote tighter pi-pi packing and larger sizes of crystalline domains. Such morphological changes of the PTB7-Th: P(NDI2HD-T) blend films upon the addition of DTI enhance the exciton lifetime and diffusion length, which are proved by static and femtosecond-transient absorption spectroscopies and time-resolved photoluminescence. As a result of improved exciton dissociation probability and charge transport, the short-circuit current density of all-PSCs is greatly increased. Importantly, we also show that the DTI additive can be applied to other all-PSC systems with different polymer donors and naphthalene diimide (NDI)-based polymer acceptors, where the efficiencies of all-PSCs are enhanced by 10-20%.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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