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Dual-Channel Förster Resonance Energy Transfer Boosting Exciton Utilization Efficiency for High-Performance

Shizhao Liu¹, Yanna Sun¹, Meiyuan Zu²

¹Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion, Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao, 266237, P. R. China.

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Summary

High-performance all-small-molecule organic solar cells (ASM-OSCs) were developed using a layer-by-layer deposition strategy. This method improved exciton utilization and achieved a record power conversion efficiency of 17.76%.

Keywords:

all‐small‐molecule organic solar cell dual‐channel förster resonance energy transfer exciton utilization efficiency layer‐by‐layer morphology

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Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

All-small-molecule organic solar cells (ASM-OSCs) offer advantages like precise molecular structure and batch consistency.
However, controlling active layer morphology limits exciton utilization and power conversion efficiency (PCE) compared to polymer-based devices.

Purpose of the Study:

To enhance ASM-OSC performance by improving active layer morphology and exciton utilization efficiency.
To develop a novel deposition strategy for high-performance ASM-OSCs.

Main Methods:

Incorporation of a small molecule donor (Por-BR) into the acceptor layer of the DAPor-DPP/6TIC system.
Utilizing a layer-by-layer (LbL) deposition strategy to control blend morphology and vertical phase distribution.
Investigating dual-channel Förster Resonance Energy Transfer (FRET) from Por-BR to the donor and acceptor materials.

Main Results:

The LbL strategy promoted a distinct vertical phase distribution in the active layer.
Dual-channel FRET was observed, broadening exciton generation sites and enhancing exciton utilization.
The optimized ASM-OSC achieved a power conversion efficiency (PCE) of 17.76%, a significant advancement for this technology.
Improved carrier mobility and reduced charge recombination were also observed.

Conclusions:

The LbL deposition strategy combined with dual-channel FRET effectively enhances ASM-OSC performance.
This approach offers a viable pathway for increasing exciton utilization and device efficiency.
The achieved PCE represents a significant milestone, paving the way for the commercialization of ASM-OSCs.