期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 17, 页码 14945-14952出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b16487
关键词
organic solar cells; organic semiconductors; light harvesting; excitation energy transfer; bulk heterojunctions
资金
- Engineering and Physical Sciences Research Council of the UK [EP/L505079/1, EP/L017008/1, EP/J009016/1]
- European Research Council of the European Union [321305]
- Royal Society Wolfson Research Merit Award
- Engineering and Physical Sciences Research Council [EP/J009016/1, 1484002] Funding Source: researchfish
- EPSRC [EP/J009016/1] Funding Source: UKRI
Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)(2). Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor, exciton-exciton annihilation, and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 x 10(-3) to 3.6 x 10(-3) cm(2) s(-1), resulting in an enhancement of the mean two-dimensional exciton diffusion length (L-D = (4D tau)(1/2)) from 15 to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.
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