期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 3, 页码 442-447出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz302150q
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资金
- PRIN programme [2008JKBBK4]
- EPSRC
- ERC [ERC-2011-StG 279881-HYPER]
- Engineering and Physical Sciences Research Council [EP/G049653/1] Funding Source: researchfish
- EPSRC [EP/G049653/1] Funding Source: UKRI
There has been phenomenal effort synthesizing new low-band gap polymer hole-conductors which absorb into the near-infrared (NIR), leading to >10% efficient all-organic solar cells. However, organic light absorbers have relatively narrow bandwidths, making it challenging to obtain panchromatic absorption in a single organic semiconductor. Here, we demonstrate that (poly[2,6-(4,4-bis-(2-ethylhexyl)-4Hcyclopenta[2,1-b;3,4-b0]clithiophene)-alt-4,7-(2,1,3-benzothiadia-zole)] (PCPDTBT) can be photo-sensitized across the whole visible spectrum by doping with a visible absorbing dye, the (2,2,7,7-tetrakis(3-hexyl-5-(7-(4-hexylthiophen-2-yObenzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)-9,9-spirobifluorene) (spiro-TBT). Through a comprehensive sub-12 femtosecond nanosecond spectroscopic study, we demonstrate that extremely efficient and fast energy transfer occurs from the photoexcited spiro-TBT to the PCPDTBT, and ultrafast charge injection happens when the system is interfaced with ZnO as a prototypal electron-acceptor compound. The visible photosensitization can be effectively exploited and gives panchromatic photoresponse in prototype polymer/oxide bilayer photovoltaic diodes. This concept can be successfully adopted for tuning and photoresponse in a broad range of polymeric and hybrid solar cells.
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