Efficient Solar Cells Based on a Polymer Donor with β-Branching in Trialkylsilyl Side Chains

Haijun Bin; Martijn M. Wienk; René A. J. Janssen

doi:10.1055/s-0041-1726427

Organic Materials, Inhaltsverzeichnis

CC BY-NC-ND 4.0 · Organic Materials 2021; 03(02): 134-140
DOI: 10.1055/s-0041-1726427

Focus Issue: Peter Bäuerle 65th Birthday

Original Article

Efficient Solar Cells Based on a Polymer Donor with β-Branching in Trialkylsilyl Side Chains

Haijun Bin

^aMolecular Materials and Nanosystems and Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

,

Martijn M. Wienk

^aMolecular Materials and Nanosystems and Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

,

René A. J. Janssen

^aMolecular Materials and Nanosystems and Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

^bDutch Institute for Fundamental Energy Research, De Zaale 20, 5612 AJ, Eindhoven, The Netherlands

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Abstract

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Abstract

Side-chain engineering is an important strategy in designing novel polymer semiconductor materials for high-efficient organic solar cells. The use of trialkylsilyl side chains can improve the photovoltaic efficiency by decreasing the energy of the HOMO of the polymer and improving its crystallinity and hole mobility. Compared to simple linear derivatives, α-branching in the alkyl groups of trialkylsilyl side chains causes strong aggregation and excessive phase separation in the photoactive layer, leading to poor device performance. β-Branching of the alkyl groups has not yet been used in trialkylsilyl side chains. Herein, we describe a new polymer (J77) with triisobutylsilyl side chains to investigate the effect of β-branching on the molecular aggregation, optical properties, energy levels, and photovoltaic properties. We find that compared to α-branching, β-branching of alkyl groups in trialkylsilyl side chains significantly reduces aggregation. This enables J77 to form blend morphologies in films that provide high-efficient solar cells in combination with different non-fullerene acceptors. Moreover β-branching of the alkyl groups in trialkylsilyl side chains lowers the HOMO energy level of J77 and increases the open-circuit voltage of J77-based solar cells without sacrificing short-circuit current density or fill factor.

Key words

organic solar cells - polymer donors - non-fullerene acceptors - cross-coupling - power conversion efficiencies

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