Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 10, Pages 3796-3802Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00915
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Funding
- Knut and Alice Wallenberg Foundation (KAW) through a Wallenberg Scholar grant
- China Scholarship Council (CSC) [201508320244]
- International Science Programme (ISP), Uppsala University, Sweden
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The dissociation of hybrid local exciton and charge transfer excitons (LECT) in efficient bulk-heterojunction nonfullerene solar cells contributes to reduced nonradiative photovoltage loss, a mechanism that still remains unclear. Herein we studied the energetic and entropic contribution in the hybrid LE-CT exciton dissociation in devices based on a conjugated terpolymer. Compared with reference devices based on ternary blends, the terpolymer devices demonstrated a significant reduction in the nonradiative photovoltage loss, regardless of the acceptor molecule, be it fullerene or nonfullerene. Fourier transform photocurrent spectroscopy revealed a significant LE-CT character in the terpolymer-based solar cells. Temperature-dependent hole mobility and photovoltage confirm that entropic and energetic effects contribute to the efficient LE-CT dissociation. The energetic disorder value measured in the fullerene- or nonfullerene-based terpolymer devices suggested that this entropic contribution came from the terpolymer, a signature of higher disorder in copolymers with multiple aromatic groups. This gives new insight into the fundamental physics of efficient LE-CT exciton dissociation with smaller nonradiative recombination loss.
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