A Photoconductor‐Type Position Recognition Mechanism with the Intrinsic High Gain for the Development of Ultra‐Sensitive Light Position Detection

Author:

Zeng Peiyu1,Liu Kaiyang1,Zhang Peng1,Sun Hui2,Wang Wenhui1ORCID,Ni Zhenhua13,Lu Junpeng13

Affiliation:

1. Key Laboratory of Quantum Materials and Devices of Ministry of Education School of Physics Southeast University Nanjing 211189 P. R. China

2. School of Space Science and Physics Shandong University Weihai Shandong 264209 P. R. China

3. School of Electronic Science and Engineering Southeast University Nanjing 211189 P. R. China

Abstract

AbstractPosition‐sensitive detectors (PSDs) are widely used in optical inspection applications, such as precise measurement of distance and angle, surface profiling, and motion tracking, etc. The lateral photovoltaic effect is the mechanism employed by most PSDs to determine position, but its gain‐free nature hinders weak‐light detection and applications. Here, a new position recognition mechanism with an intrinsic high gain is proposed and employ it to design a weak‐light and large‐size photoconductor‐type PSD. The position recognition is established by the intrinsic link between the gain and channel length in a photoconductor, and the designed linear correlation between the channel length and position. The photoconductor‐type graphene/Si PSD based on the recognition mechanism shows an active length of over 1 mm, a high spatial position resolution at the sub‐micrometer level, and a low detection limit power of 100 pW. Compared with Si PSDs, the gain of the photoconductor‐type PSD is improved by 3–4 orders of magnitude. In addition, the operational wavelength range of the PSD is expanded to include the near‐infrared region, specifically at 1300 and 1550 nm. The new position recognition mechanism paves the way for the development of ultra‐sensitive light position detection.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

Wiley

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