科研之友
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摘要
The photoelectrochemistry ( PEC) of poly(3-hexylthiophene) ( P3HT) is investigated by studying the photocathodic reduction of anthraquinone-2,7-disulfonate ( AQ27DS). A photocurrent of approximate to 100 mu A cm(-2) is obtained using approximate to 5 x 10(-3) M AQ27DS and 100 mW cm(-2) visible light. The photon-to current-efficiency approaches approximate to 1% when irradiated with low intensity monochromatic light. The photoreduction proceeds by either a 2-electron, 2-proton, or 2-electron, 1-proton process depending on the solution pH. The band energy levels of P3HT shift by approximate to 150 mV in contact with aqueous solutions over a 1-12 pH range, and considerable more in the presence of AQ27DS during PEC, to the extent that Fermi level pinning occurs. This work reveals that the efficiency of electron-hole separation is required to improve photoefficiency and the interaction of redox couples with the P3HT semiconductor interface is warranted in order to understand the photovoltages developed across the semiconductor/electrolyte interfaces.
- 出版日期2016-5
