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arXiv · 2107.09236

Narrow-band photodetection by heterolattice electronic transitions in TiO$_2$ glass embedded with nanocrystals

Zhipeng Wei·Xuan Fang·Peter Y. Yu·Jiaxu Yan·Dengkui Wang·Jilong Tang·Kewei Liu·Hai Xu·Xaiobo Chen·Lei Liu·D. Z. Shen
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Abstract

In this letter, we propose that the narrowband photodetection can be realized in the skin layer of semiconductors with the spatially separated photo-excited carriers from the nanoscale heterolattice electronic transitions (NanoHLETs). The NanoHLET photodetection is demonstrated by measuring the photoconductive responses of the $\sim$ 1 $μ$m thick films of TiO$_{2}$ glass embedded with rutile and anatase TiO$_{2}$ nanocrystals. As containing only rutile nanocrystals, the TiO$_{2}$ glass film presents the responsivity curve with only one sharp peak centered at 423.0 nm with a full-width-at-half-maximum (FWHM) of 13.7 nm. This NanoHLET mechanism may open a new way in making ultra-small narrow-band photodetectors matching the current nanoscale electronic technology.

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Zhipeng Wei, Xuan Fang, Peter Y. Yu, Jiaxu Yan, Dengkui Wang, Jilong Tang, Kewei Liu, Hai Xu, Xaiobo Chen, Lei Liu, D. Z. Shen. 2021-07-20. Narrow-band photodetection by heterolattice electronic transitions in TiO$_2$ glass embedded with nanocrystals. https://arxiv.org/abs/2107.09236

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