Carrier generation and transport in bulk heterojunction films processed with 1,8-octanedithiol as a processing additive
Cited 45 times inCited 38 times in
- Carrier generation and transport in bulk heterojunction films processed with 1,8-octanedithiol as a processing additive
- Hwang, In-Wook; Cho, Shinuk; Kim, Jin Young; Lee, Kwanghee; Coates, Nelson E.; Moses, Daniel; Heeger, Alan J.
- POLYMER SOLAR-CELLS; LOW-BANDGAP POLYMER; PHOTOVOLTAIC CELLS; POLYFLUORENE COPOLYMER; CONJUGATED POLYMER; ELECTRON-TRANSFER; PERFORMANCE; DEVICES
- Issue Date
- AMER INST PHYSICS
- JOURNAL OF APPLIED PHYSICS, v.104, no.3, pp.1 - 9
- Improved performance of polymer-based solar cells based on poly[2,6-(4,4-bis-(2-ethylhexyl)- 4H -cyclopenta[2,1-b;3,4- b′] dithiophene)-alt-4,7-(2,1,3-benzo-thiadiazole)] PCPDTBT has been obtained by using 1,8-octanedithiol (ODT) as a processing additive in the polymer solution used to spin cast the bulk heterojunction films. Although ultrafast spectroscopy studies indicate that the carrier losses are reduced in the films processed with ODT [similar to the reduced carrier losses after thermal annealing of bulk heterojunction (BHJ) materials made from P3HT:PCBM], the magnitude of the reduction is not sufficient to explain the observed factor of 2 increase in the power conversion efficiency. From the analysis of carrier transport in field effect transistors, we find increased electron mobility in the PCPDTBT: PC70 BM composites when fabricated with ODT, which is indicative of enhanced connectivity of PC70 BM networks. The improved electron mobility appears to be the primary origin of the improved power conversion efficiency in BHJ films.
- ; Go to Link
- Appears in Collections:
- ECHE_Journal Papers
- Files in This Item:
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.