期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 2, 页码 399-403出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz402299a
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资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
- Japan Society for the Promotion of Science for Young Scientists
Singlet exciton dynamics in crystalline domains of regioregular poly(3-hexylthiophene) (P3HT) films was studied by transient absorption spectroscopy. Upon the selective excitation of crystalline P3HT at the absorption edge, no red shift of the singlet exciton band was observed with an elapse of time, suggesting singlet exciton dynamics in relatively homogeneous P3HT crystalline domains without downhill relaxation in the energetic disorder. Even under such selective excitation conditions, the annihilation rate coefficient gamma(t) was still dependent on time, gamma(t) alpha t(-1/2), which is attributed to anisotropic exciton diffusion in P3HT crystalline domains. From the annihilation rate coefficient, the singlet exciton diffusion coefficient D and exciton diffusion length L-D in the crystalline domains were evaluated to be 7.9 X 10(-3) cm(2) s(-1) and 20 nm, respectively. The origin of the time-dependent exciton dynamics is discussed in terms of dimensionality.
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