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Issue 28, 2017
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Highly and homogeneously conductive conjugated polyelectrolyte hole transport layers for efficient organic solar cells

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Abstract

High mobility, stable and thick hole-transporting layer (HTL) materials are highly desirable for organic solar cells (OSCs). In this work, two pH neutral conjugated polyelectrolytes (CPEs), namely PCPDT-T and PCPDT-2T, based on 3,4-dithia-7H-cyclopenta[a]pentalene and thienyl units with a self-doping effect were designed and synthesized. Between the two CPEs, the PCPDT-T exhibits higher, more homogeneous mobility and appropriate work function, which makes it an ideal HTL material for OSCs. The single-junction OSCs modified with the PCPDT-T HTL showed an outstanding power conversion efficiency of 9.3%, which is much higher than that of the PEDOT:PSS-modified devices (8.0%). Notably, the PCPDT-T HTL exhibits excellent thickness insensitivity in fabricating OSC devices, i.e. OSC devices with very thick PCPDT-T interlayers over 50 nm still demonstrated high power conversion efficiencies over 7.1%, which is very compatible to meet the requirement for future roll-to-roll printing.

Graphical abstract: Highly and homogeneously conductive conjugated polyelectrolyte hole transport layers for efficient organic solar cells

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Publication details

The article was received on 24 Mar 2017, accepted on 20 Jun 2017 and first published on 20 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02590D
Citation: J. Mater. Chem. A, 2017,5, 14689-14696
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    Highly and homogeneously conductive conjugated polyelectrolyte hole transport layers for efficient organic solar cells

    H. Xu, X. Fu, X. Cheng, L. Huang, D. Zhou, L. Chen and Y. Chen, J. Mater. Chem. A, 2017, 5, 14689
    DOI: 10.1039/C7TA02590D

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