Excitation Intensity Dependent Carrier Dynamics of Chalcogen Heteroatoms in Medium-Bandgap Polymer Solar Cellsopen access
- Authors
- Kulshreshtha, Chandramouli; Son, Jiwon; Pascher, Torbjorn; Kim, Ji-Hee; Joo, Taiha; Lee, Jaewon; Jeong, Mun Seok; Cho, Kilwon
- Issue Date
- Apr-2017
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.7, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 7
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/152525
- DOI
- 10.1038/s41598-017-00834-0
- ISSN
- 2045-2322
- Abstract
- The excitation intensity dependent carrier dynamics of blends with PC[70] BM of three new medium-band gap conjugated polymers with central chalcogen heteroatoms, PBDTfDTBX (X = O, T(Sulphur), Se) were studied. The PBDTfDTBX polymers (Poly[4,8-bis(5-(2-butyloctyl)thiophene-2-yl)benzo[1,2-b; 4,5-b']dithiophene-alt-4,7-bis(4-(2-ethylhexyl)-2-thienyl)-dithieno[3',2': 3,4;2".,3".: 5,6]benzo[1,2-c] [1,2,5] furazan or thiadiazole or selenadiazole]) have symmetrical structures but exhibit different solar cell performances. In this study, we determined how the photogenerated charge carrrier dynamics of the PBDTfDTBX: PC[70] BM blends varies with the heteroatom by performing transient absorption measurements at various excitation intensities. It was found that the charge carrier dynamics of the PBDTfDTBX blends with X = T or Se heteroatoms are dependent on the excitation intensity whereas that of the PBDTfDTBO blend is independent of the intensity. The photogenerated charge carrier dynamics of the PBDTfDTBO: PCBM, PBDTfDTBT: PCBM, and PBDTfDTBSe: PCBM blends were all modeled globally and rates were estimated for different photophysical processes occurring on different time scales.
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