Small molecule based: N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells

Yuvraj Patil; Rajneesh Misra; Fang-Chung Chen; Ganesh D. Sharma

doi:10.1039/c6cp03767d

Small molecule based: N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells

Yuvraj Patil, Rajneesh Misra^*, Fang-Chung Chen, Ganesh D. Sharma

^*Corresponding author for this work

Department of Photonics

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

20 Scopus citations

Abstract

We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC₇₁BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (J_sc = 8.19 mA cm^-2, V_oc = 0.98 V and FF = 0.58) and 5.73% (J_sc = 9.58 mA cm^-2, V_oc = 0.98 V and FF = 0.61), for DPP5:PC₇₁BM and DPP6:PC₇₁BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.

Original language	English
Pages (from-to)	22999-23005
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	18
Issue number	33
DOIs	https://doi.org/10.1039/c6cp03767d
State	Published - 2016

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title = "Small molecule based: N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells",

abstract = "We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (Jsc = 8.19 mA cm-2, Voc = 0.98 V and FF = 0.58) and 5.73% (Jsc = 9.58 mA cm-2, Voc = 0.98 V and FF = 0.61), for DPP5:PC71BM and DPP6:PC71BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.",

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T2 - N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells

AU - Patil, Yuvraj

AU - Misra, Rajneesh

AU - Chen, Fang-Chung

AU - Sharma, Ganesh D.

PY - 2016

Y1 - 2016

N2 - We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (Jsc = 8.19 mA cm-2, Voc = 0.98 V and FF = 0.58) and 5.73% (Jsc = 9.58 mA cm-2, Voc = 0.98 V and FF = 0.61), for DPP5:PC71BM and DPP6:PC71BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.

AB - We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (Jsc = 8.19 mA cm-2, Voc = 0.98 V and FF = 0.58) and 5.73% (Jsc = 9.58 mA cm-2, Voc = 0.98 V and FF = 0.61), for DPP5:PC71BM and DPP6:PC71BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.

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JO - Physical Chemistry Chemical Physics

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Small molecule based: N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells

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