Transport Pathway Engineering in a Three-Terminal Diamond Schottky Photodiode for High-Temperature Dual-Mode Solar-Blind Ultraviolet Detection.

Authors

Yitong Zheng, Saifei Fan, Bo Liang, Kang Zheng, Hongda Zhu, Chenxi Sun, Chongze Yue, Derui Kong, Sen Zhang, Benjian Liu, Kang Liu, Jiaqi Zhu

Published in

ACS applied materials & interfaces. Oct 20, 2026. Epub Oct 20, 2026.

Abstract

Diamond is promising for solar-blind ultraviolet (SBUV) photodetection in high-temperature extreme environments. However, stable self-powered operation and high-gain response are difficult to reconcile in diamond photodetectors. Photovoltaic diamond photodiodes offer stable zero-bias operation at the expense of limited responsivity, whereas photoconductive-type devices provide gain but often compromise thermal robustness. Here, we introduce transport-pathway engineering in a three-terminal diamond Schottky photodiode to realize dual-mode high-temperature SBUV detection. The device consists of a common Pt/O-terminated diamond Schottky terminal on a single-crystal boron-doped diamond epitaxial platform, together with a backside ohmic terminal and a coplanar ohmic terminal that share the same diamond drift layer. By selecting the carrier-collection terminal, this three-terminal architecture defines either one-dimensional vertical transport (VT) or mixed vertical-lateral transport (VLT) within a unified diamond Schottky photodiode. From 300 to 580 K, the VT pathway supports low dark current, stable self-powered photovoltaic operation with a root-mean-square current fluctuation of 0.81 fA, whereas the VLT pathway enables high-gain biased detection at elevated temperature. Under 215 nm illumination at 580 K, the high-gain detection mode achieves a responsivity of 919.2 A·W-1 at 10 V and a specific detectivity of 7.72 × 1013 Jones under the shot-noise-limited approximation. These results demonstrate that transport-pathway engineering provides a route to complementary self-powered photovoltaic and high-gain biased operating modes in thermally robust diamond Schottky photodiodes for high-temperature optoelectronics.

PMID:
42896840
Bibliographic data and abstract were imported from PubMed on 20 Oct 2026.

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