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Steric hindrance induced low exciton binding energy enables low‐driving‐force organic solar cells
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Steric hindrance induced low exciton binding energy enables low‐driving‐force organic solar cells
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Journal Article
Steric hindrance induced low exciton binding energy enables low‐driving‐force organic solar cells
2024
Overview
Exciton binding energy (Eb) has been regarded as a critical parameter in charge separation during photovoltaic conversion. Minimizing the Eb of the photovoltaic materials can facilitate the exciton dissociation in low‐driving force organic solar cells (OSCs) and thus improve the power conversion efficiency (PCE); nevertheless, diminishing the Eb with deliberate design principles remains a significant challenge. Herein, bulky side chain as steric hindrance structure was inserted into Y‐series acceptors to minimize the Eb by modulating the intra‐ and intermolecular interaction. Theoretical and experimental results indicate that steric hindrance‐induced optimal intra‐ and intermolecular interaction can enhance molecular polarizability, promote electronic orbital overlap between molecules, and facilitate delocalized charge transfer pathways, thereby resulting in a low Eb. The conspicuously reduced Eb obtained in Y‐ChC5 with pinpoint steric hindrance modulation can minimize the detrimental effects on exciton dissociation in low‐driving‐force OSCs, achieving a remarkable PCE of 19.1% with over 95% internal quantum efficiency. Our study provides a new molecular design rationale to reduce the Eb. An effective method for reducing the exciton binding energy (Eb) of Y‐series molecules by manipulating both intra‐ and intermolecular interaction was demonstrated through a joint experimental and theoretical investigation. The significantly decreased Eb obtained in Y‐ChC5 via meticulous adjustment of steric hindrance can still facilitate effective exciton dissociation and charge generation under small interfacial energy offsets in organic solar cells.
Publisher
John Wiley & Sons, Inc,Wiley
