کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
26126 | 43935 | 2015 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photochemistry of P3HT and PC60BM in toluene solution: Evidence of T–T energy transfer Photochemistry of P3HT and PC60BM in toluene solution: Evidence of T–T energy transfer](/preview/png/26126.png)
• Photochemistry of P3HT/PC60BM mixture in toluene was studied by laser flash photolysis.
• Excitation of the mixture leads to energy transfer from polymer triplet state to fullerene.
• Quantum yields of polymer and fullerene triplet state formation were estimated.
• No evidence of electron transfer from P3HT triplet state to PC60BM was observed.
Photochemical properties of regioregular poly(3-hexylthiophene) (P3HT), fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester (PC60BM) and their 1:1 mixture in argon-saturated toluene solution were studied by optical spectroscopy and nanosecond laser flash photolysis (λex = 532 nm). Separate excitation of components leads to formation of corresponding triplet state of fullerene (3PC60BM*, λmax = 710 nm, ϵmax = 22400 M−1 cm−1, φT = 0.29) and polymer (3P3HT*, λmax = 850 nm, ϵ750 nm ≤ 105 M−1 cm−1, φT ≥ 0.19). Excitation of P3HT/PC60BM mixture leads to effective energy transfer from 3P3HT* to the ground state of fullerene with a formation of 3PC60BM*. No evidence of ion-radical P3HT+ and PC60BM− formation was obtained though electron transfer between 3P3HT* and 1PC60BM is energetically favorable in studied system. Presumably ultrafast back electron transfer takes place in geminate P3HT+/PC60BM− pair with regeneration of the ground states of P3HT and PC60BM.
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Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 311, 1 October 2015, Pages 193–198