Abstract
The lateral photovoltaic effect (LPE) can be used in position-sensitive detectors to detect very small displacements due to its output of lateral photovoltage changing linearly with light spot position. In this review, we will summarize some of our recent works regarding LPE in metal-semiconductor and metal-oxide-semiconductor structures, and give a theoretical model of LPE in these two structures.
Highlights
Since the lateral photovoltaic effect (LPE) effect was first discovered by Schottky [1] and later in 1957 expanded upon by Wallmark in floating Ge p-n junctions [2], it was boosted very quickly in many different semiconductor systems, such as Ti/Si amorphous superlattices [3,4,5,6], modulation-doped AlGaAs/GaAs heterostructures [7], hydrogenated amorphous silicon Schottky barrier structures [8,9,10,11,12,13], organic
Due to the fact its output of lateral photovoltage (LPV) changes linearly with light spot position, this effect can be used in position-sensitive detectors (PSDs) which can detect very small displacements [22,23,24,25,26,27,28,29,30,31,32,33,34,35]
PSDs based on the LPE can provide continuous optical information over large areas with no internal discontinuities, which is the major advantage over arrayed discrete devices such as charge coupled devices and photodiodes
Summary
The lateral photovoltaic effect (LPE) is an attributive character of some semiconductor structures. Since the LPE effect was first discovered by Schottky [1] and later in 1957 expanded upon by Wallmark in floating Ge p-n junctions [2], it was boosted very quickly in many different semiconductor systems, such as Ti/Si amorphous superlattices [3,4,5,6], modulation-doped AlGaAs/GaAs heterostructures [7], hydrogenated amorphous silicon Schottky barrier structures [8,9,10,11,12,13], organic. The main area of application of PSDs is in precision optical alignment, such as biomedical applications, robotics, process control, medical instrumentation, and position information systems [36,37,38,39]. MS and MOS structures are versatile materials and have been treated as solar cells for many decades [58,59,60,61,62,63], but they serve as LPE materials is pretty new, in particular their large LPE can be directly obtained or measured on the metal side
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