Transition from photoconductivity to photovoltaic effect in P3HT/CuInSe 2 Composites

Yang Yang; Haizheng Zhong; Zelong Bai; Bingsuo Zou; Yongfang Li; Gregory D. Scholes

doi:10.1021/jp300973c

Transition from photoconductivity to photovoltaic effect in P3HT/CuInSe ₂ Composites

Yang Yang, Haizheng Zhong^*, Zelong Bai, Bingsuo Zou, Yongfang Li, Gregory D. Scholes

^*Corresponding author for this work

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe ₂ nanocrystals (NCs). CuInSe ₂ NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO-LUMO energy levels, as well as the energies of trap states intrinsic to CuInSe ₂ NCs. The results suggest that nanocrystal-polymer charge transfer is foreseeable in the P3HT and CuInSe ₂ system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe ₂ NCs as a function of P3HT/CuInSe ₂ NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe ₂ ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe ₂ NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe ₂ weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe ₂ NCs.

Original language	English
Pages (from-to)	7280-7286
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	13
DOIs	https://doi.org/10.1021/jp300973c
Publication status	Published - 5 Apr 2012

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title = "Transition from photoconductivity to photovoltaic effect in P3HT/CuInSe 2 Composites",

abstract = "We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe 2 nanocrystals (NCs). CuInSe 2 NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO-LUMO energy levels, as well as the energies of trap states intrinsic to CuInSe 2 NCs. The results suggest that nanocrystal-polymer charge transfer is foreseeable in the P3HT and CuInSe 2 system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe 2 NCs as a function of P3HT/CuInSe 2 NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe 2 ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe 2 NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe 2 weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe 2 NCs.",

author = "Yang Yang and Haizheng Zhong and Zelong Bai and Bingsuo Zou and Yongfang Li and Scholes, {Gregory D.}",

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T1 - Transition from photoconductivity to photovoltaic effect in P3HT/CuInSe 2 Composites

AU - Yang, Yang

AU - Zhong, Haizheng

AU - Bai, Zelong

AU - Zou, Bingsuo

AU - Li, Yongfang

AU - Scholes, Gregory D.

PY - 2012/4/5

Y1 - 2012/4/5

N2 - We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe 2 nanocrystals (NCs). CuInSe 2 NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO-LUMO energy levels, as well as the energies of trap states intrinsic to CuInSe 2 NCs. The results suggest that nanocrystal-polymer charge transfer is foreseeable in the P3HT and CuInSe 2 system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe 2 NCs as a function of P3HT/CuInSe 2 NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe 2 ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe 2 NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe 2 weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe 2 NCs.

AB - We report the investigation of composites of poly-(3-hexylthiophene) (P3HT) and CuInSe 2 nanocrystals (NCs). CuInSe 2 NCs were synthesized at gram scale through a colloidal route. Cyclic voltammetry was used to determine the HOMO-LUMO energy levels, as well as the energies of trap states intrinsic to CuInSe 2 NCs. The results suggest that nanocrystal-polymer charge transfer is foreseeable in the P3HT and CuInSe 2 system because of their type II band alignment. We studied optical properties of the hybrid composite films of P3HT and CuInSe 2 NCs as a function of P3HT/CuInSe 2 NCs weight ratios. The quenching of photoluminescence spectra with the increase of CuInSe 2 ratio in the composite was interpreted to result from charge transfer between the polymer and CuInSe 2 NCs. We further studied photodiode devices that exhibited a transition from photoconductive gain to the photovoltaic effect with an increase of the P3HT/CuInSe 2 weight ratio. Performance of the photovoltaic devices was strongly limited by intrinsic traps associated with the CuInSe 2 NCs.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

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Transition from photoconductivity to photovoltaic effect in P3HT/CuInSe ₂ Composites

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