Transition from Photoconductivity to Photovoltaic Effect in P3HT/CuInSe2 Composites

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• 作者：Yang Yang ; Haizheng Zhong ; Zelong Bai ; Bingsuo Zou ; Yongfang Li ; Gregory D. Scholes
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：April 5, 2012
• 年：2012
• 卷：116
• 期：13
• 页码：7280-7286
• 全文大小：414K
• 年卷期：v.116,no.13(April 5, 2012)
• ISSN：1932-7455

文摘

We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe₂ nanocrystals (NCs). CuInSe₂ NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO鈥揕UMO energy levels, as well as the energies of trap states intrinsic to CuInSe₂ NCs. The results suggest that nanocrystal鈥損olymer charge transfer is foreseeable in the P3HT and CuInSe₂ system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe₂ NCs as a function of P3HT/CuInSe₂ NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe₂ ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe₂ NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe₂ weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe₂ NCs.