3C-SiC/Si Heterostructure: An Excellent Platform for Position-Sensitive Detectors Based on Photovoltaic Effect

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Foisal, Abu Riduan Md
Thanh, Nguyen
Toan, Dinh
Tuan, Khoa Nguyen
Tanner, Philip
Streed, Erik W
Dzung, Viet Dao
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2019
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Abstract

Single-crystalline silicon carbide (3C-SiC) on the Si substrate has drawn significant attention in recent years due to its low wafer cost and excellent mechanical, chemical, and optoelectronic properties. However, the applications of the structure have primarily been focused on piezoresistive and pressure sensors, bio-microelectromechanical system, and photonics. Herein, we report another promising application of the heterostructure as a laser spot position-sensitive detector (PSD) based on the lateral photovoltaic effect (LPE) under nonuniform optical illuminations at zero-bias conditions. The LPE shows a linear dependence on spot positions, and the sensitivity is found to be as high as 33 mV/mm under an illumination of 2.8 W/cm2 (635 nm). The structure also exhibits a linear dependence of the LPE over a large distance (7 mm) between two electrodes, which is crucial for PSDs as the region with a linear dependence of LPE is only usable for PSDs. The LPE at different spot positions and under different illumination conditions have been investigated and explained based on the energy-band analysis. The temperature dependence of the LPE and position sensitivity is also investigated. Furthermore, the two-dimensional mapping of the lateral photovoltages reveals the potential for utilizing the 3C-SiC/Si heterostructure to detect the laser spot position precisely on a plane.

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ACS Applied Materials & Interfaces

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11

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43

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This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, © 2019 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acsami.9b15855

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Nanomaterials

Physical sciences

Materials engineering

Chemical sciences

Engineering

Science & Technology

Technology

Nanoscience & Nanotechnology

Materials Science, Multidisciplinary

Science & Technology - Other Topics

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Foisal, ARM; Thanh, N; Toan, D; Tuan, KN; Tanner, P; Streed, EW; Dzung, VD, 3C-SiC/Si Heterostructure: An Excellent Platform for Position-Sensitive Detectors Based on Photovoltaic Effect, ACS Applied Materials & Interfaces, 2019, 11 (43), pp. 40980-40987

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