Enhanced photovoltaic efficiency by controlling the self-assembly of cyanopyridone-based oligothiophene donors
Jingliang Li c, Amanpreet Kaur Hundal a, Salman Ali b, Anubha Agarwal c, Mohammed A. Jameel b, Lathe A. Jones a, Richard A. Evans d, Steven J. Langford b, Akhil Gupta b d
a 1. Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001 Australia
b 2. Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; E-mail: akhilgupta@swin.edu.au
c 3. Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia; E-mail: jingliang.li@deakin.edu.au.
d CSIRO Manufacturing, Bayview Avenue, Clayton South, Victoria 3169 Australia.
Proceedings of International Conference on Advanced Light Absorbing Materials for Next Generation Photovoltaics (ABSOGEN)
Online, Spain, 2020 November 17th - 18th
Organizers: Hongxia Wang, Xiaojing Hao and Lydia Wong
Poster, Jingliang Li, 025
Publication date: 6th November 2020

Organic photovoltaic (OPV) devices have advantages, such as lightweight, low-cost and device flexibility, over their inorganic counterparts. However, the active thin film of a BHJ device is formed conventionally by drying a layer of a solution of electron donor and acceptor. With this approach, achieving a fine control over the domain sizes of electron donor and acceptor is challenging. The donor and acceptor tend to separate into individual domains that are too big (micro or sub-micrometre size) for efficient charge transfer and exciton formation. In addition, the films lack a percolating donor and acceptor networks, which leads to frequent recombination of charges before they reach electrodes. To address these problems, we designed novel donor molecules that can self-assemble into nanofibrous networks upon evaporation of common processing solvents. The blend films of the donors with acceptor PC71BM present nanoscale honeycomb-like structure that forms percolating donor and acceptor networks to facilitate charge generation and transport. The power conversion efficiency of BHJ devices is more than doubled. Our work provides a facile approach for the development of efficient OPV devices.

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