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Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface.

ABSTRACT: Organic solar cells (OSCs) achieve 21% efficiency, yet non-radiative energy loss (qΔV_nr) remains a critical barrier to further improve the open-circuit voltage (V_OC). This loss is primarily governed by the optoelectronic properties of interfacial CT states, yet the precise role of electron-phonon coupling (EPC) is not fully resolved. Through analysis of three all-polymer OSCs and four small molecule acceptor (SMA)-based OSCs, we identify two donor-acceptor (D-A) interfacial mixed phases that foster two distinct CT states, establishing efficient charge generation. These two phases emerge from amorphous D-A entanglement, termed as Entangled (E-) interface, and the penetration of acceptor quasi-aggregates into donor polymer matrix, termed as Penetrated (P-) interfaces. The P-interface exhibits inherently weaker EPC than that of E-interface since the suppressed intramolecular interaction. As the results, the P-interfaces, governing all-polymer OSCs, achieve a significant reduction of ~60 meV in qΔV_nr compared to E-interface dominated SMA-based OSCs. The incorporation of PA into SMA system as guest component modulates the population of P-interface reducing the EPC and then enhancing V_OC. Overall, our work suggests that modulating the population of P-interfaces to suppress EPC is a viable strategy for reducing non-radiative voltage loss and overcoming the efficiency bottleneck of organic solar cells.

SUBMITTER: Luo Y

PROVIDER: S-EPMC12946207 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature

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Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface.

Luo Yongmin Y Hai Yulong Y Li Yao Y Ma Ruijie R Wu Lunbi L Fan Kezhou K Chan Yi Y Dela Peña Top Archie TA Dong Fangliang F Wang Ming M Lam Yeng Ming YM Yan He H Wong Kam Sing KS Jia Tao T Li Gang G Wu Jiaying J

Nature communications 20260126 1

Organic solar cells (OSCs) achieve 21% efficiency, yet non-radiative energy loss (qΔV<sub>nr</sub>) remains a critical barrier to further improve the open-circuit voltage (V<sub>OC</sub>). This loss is primarily governed by the optoelectronic properties of interfacial CT states, yet the precise role of electron-phonon coupling (EPC) is not fully resolved. Through analysis of three all-polymer OSCs and four small molecule acceptor (SMA)-based OSCs, we identify two donor-acceptor (D-A) interfacial ...[more]

PMID: 41582238

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Project description:Microbially-mediated uranium bioremediation has been demonstrated in uranium contaminated aquifers when acetate was artificially supplied and growth of the natural population of Geobacteraceae was stimulated. In order to mimic the environmental response to acetate, steady-state cells of G. sulfureducens were cultured in chemostats under conditions of either 1) acetate as the sole electron donor and limiting factor and fumarate as the sole electron acceptor or 2) acetate was supplied in excess with fumarate as sole electron acceptor and limiting factor. In silico fluxome modeling and transcriptome analysis were used as tools for investigating the cell response to the acetate availability. For global gene expression profiling, a DNA microarray of the complete G. sulfurreducens genome was used. Statistically significant results were obtained from two-color, dye swap hybridizations produced from a total of three biological replicates. Eight technical replicates were tested from two of the biological replicates and six technical replicates were tested from the third biological replicate. Major findings from this study are given as follows. The in silico model successfully predicted a higher TCA-cycle flux (ca. 2-fold) under acetate-excess conditions, suggesting that catabolism of acetate is favored with respect to anabolism, and thus more electrons are available for metal reduction. Transcriptome analyses offered a comprehensive picture of the regulation points subjected to the acetate availability. Under acetate-excess conditions, acetate transporters in the G. sulfurreducens genome were down-regulated. In addition the oxidation-related acetyl-CoA transferase was up-regulated approximately three-fold and the assimilatory-related acetate kinase was down-regulated approximately two-fold, respectively, indicating that the transcriptional regulation of acetate activation may be the key point for coping with the excess of acetate and increasing the TCA flux. The level of transcription for 10 c-type cytochromes was significantly increased in cells cultured with an excess of acetate. OmcS, an outer-membrane cytochrome which actively participates in electron transfer to Fe(III)-oxides and graphite electrodes from fuel cells, showed one of the highest fold increases in transcription. The integration of in silico modeling and genome-wide analysis shows for first time how G. sulffureducens adapts its metabolic flux and transcriptional network for optimizing the use of acetate as an electron donor for exocellular respiration instead of for use as a carbon source for biomass production. Keywords: Geobacter, gene expression, acetate limitation, fumarate limitation

Dataset Information

Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface.

Publications

Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface.

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