In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 52, No. 6R ( 2013-06-01), p. 062405-
Abstract:
A bulk heterojunction (BHJ) based on a donor (D) polymer and an acceptor (A) fullerene derivative is a promising organic photovoltaic (OPV). We investigated femtosecond charge dynamics after D (at 633 nm) and A (at 400 nm) excitations in a prototypical low-band-gap and highly efficient OPV, i.e., poly[[4,8-bis[(2-ethylhexyl)oxy] benzo[1,2- b :4,5- b ']dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4- b ]thiophenediyl]] (PTB7)/[6,6]-phenyl C 71 -butyric acid methyl ester (PC 70 BM). The photoinduced absorption (PIA) spectra of the blend film were decomposed into three PIAs, i.e., donor exciton (D * ), acceptor exciton (A * ), and carrier (D + ) components. The analysis revealed that D * →D + conversion predominates in 633 nm excitation, while A * →D + conversion predominates in 400 nm excitation. The carrier formation times of both processes are nearly the same (τ rise ∼0.2–0.3 ps).
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.7567/JJAP.52.062405
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2013
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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