Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 35, Pages 15043-15049Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202006081
Keywords
D-A structures; long lifetime excitons; organic solar cells; triplet acceptors; twisted conformation
Categories
Funding
- NSFC [21774130, 91833305, 51925306]
- National Key RAMP
- D Program of China [2018FYA 0305800]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-JSC046]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-2]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]
- International Partnership Program of Chinese Academy of Sciences [211211KYSB20170014]
- University of Chinese Academy of Sciences
- Stiftelsen for Strategisk Forskning through a Future Research Leader program [FFL18-0322]
- Swedish Foundation for Strategic Research (SSF) [FFL18-0322] Funding Source: Swedish Foundation for Strategic Research (SSF)
Ask authors/readers for more resources
Triplet acceptors have been developed to construct high-performance organic solar cells (OSCs) as the long lifetime and diffusion range of triplet excitons may dissociate into free charges instead of net recombination when the energy levels of the lowest triplet state (T-1) are close to those of charge-transfer states ((CT)-C-3). The current triplet acceptors were designed by introducing heavy atoms to enhance the intersystem crossing, limiting their applications. Herein, two twisted acceptors without heavy atoms, analogues of Y6, constructed with large pi-conjugated core and D-A structure, were confirmed to be triplet materials, leading to high-performance OSCs. The mechanism of triplet excitons were investigated to show that the twisted and D-A structures result in large spin-orbit coupling (SOC) and small energy gap between the singlet and triplet states, and thus efficient intersystem crossing. Moreover, the energy level of T-1 is close to (CT)-C-3, facilitating the split of triplet exciton to free charges.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available