研究目的
Investigating the transfer of triplet excitons from singlet fission materials into silicon solar cells and comparing different surface treatments for triplet exciton quenching.
研究成果
The study demonstrates a rapid and accurate method to screen different silicon surface treatments for triplet exciton quenching. Despite very thin interfacial layers on silicon, no evidence for transfer of either charge or excitons into silicon was found. The absence of quenching suggests the absence of wavefunction overlap necessary for efficient transfer, highlighting the challenges in achieving triplet exciton transfer into silicon solar cells.
研究不足
The method cannot distinguish between quenching at the interface by triplet transfer and quenching by charge transfer or surface traps. Additionally, the technique requires materials that show delayed fluorescence and is limited by the spatial resolution of the measurements.
1：Experimental Design and Method Selection:
The study employs an all-optical measurement technique for detecting triplet exciton quenching at semiconductor interfaces, utilizing spatially resolved delayed fluorescence and a diffusion-quenching model.
2：Sample Selection and Data Sources:
Individual, single-crystal islands of the singlet fission material (tetracene) are grown on silicon surfaces with different heights to correlate with quenching efficiency.
3：List of Experimental Equipment and Materials:
Silicon samples capped with a blocking thermal oxide and aromatic monolayers are used. Time-correlated single photon counting (TCSPC) microscopy and atomic force microscopy (AFM) are employed for measurements.
4：Experimental Procedures and Operational Workflow:
The height of tetracene islands is measured by AFM, and the lifetime of delayed fluorescence is measured by TCSPC microscopy. An automated algorithm overlaps these measurements to correlate island height with quenching efficiency.
5：Data Analysis Methods:
The photoluminescence intensity is analyzed to predict transients for tetracene islands of different thicknesses, using a model of exciton diffusion and transfer.
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