2017
DOI: 10.1002/adma.201703694
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Photovoltaic–Pyroelectric Coupled Effect Induced Electricity for Self‐Powered Photodetector System

Abstract: Ferroelectric materials have demonstrated novel photovoltaic effect to scavenge solar energy. However, most of the ferroelectric materials with wide bandgaps (2.7-4 eV) suffer from low power conversion efficiency of less than 0.5% due to absorbing only 8-20% of solar spectrum. Instead of harvesting solar energy, these ferroelectric materials can be well suited for photodetector applications, especially for sensing near-UV irradiations. Here, a ferroelectric BaTiO film-based photodetector is demonstrated that c… Show more

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Cited by 244 publications
(183 citation statements)
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“…[47][48][49] The response mechanisms of these self-powered photodetectors are based on the photovoltaic effect of semiconductors, i.e., semiconductors produce photogenerated electron-hole pairs under illumination conditions. [50][51][52] The photocurrent is generated by the separation of photogenerated electrons and holes, and the directional movement of photogenerated electrons. The difference is that the p-n junction photodetector and the Schottky junction photodetector promote the separation of photogenerated electron-hole pairs by the built-in electric field.…”
mentioning
confidence: 99%
“…[47][48][49] The response mechanisms of these self-powered photodetectors are based on the photovoltaic effect of semiconductors, i.e., semiconductors produce photogenerated electron-hole pairs under illumination conditions. [50][51][52] The photocurrent is generated by the separation of photogenerated electrons and holes, and the directional movement of photogenerated electrons. The difference is that the p-n junction photodetector and the Schottky junction photodetector promote the separation of photogenerated electron-hole pairs by the built-in electric field.…”
mentioning
confidence: 99%
“…The specific detectivity D* presents the ability to detect weak light source signals and reflects the noise in the environment, that is, D* = R/(2e·I d /S) 1/2 , [30] where I d is the value of current in the dark. [9,26] Here, we also demonstrate the value of the largest output powers in Ag/BFO/ITO photodetector by loading different resistances under 365 nm illumination (105.2 mW cm −2 ) at three typical temperatures. The above results indicate that the Ag/BFO/ITO photodetector applies to detect at temperature range around 66.1 °C.…”
Section: Resultsmentioning
confidence: 57%
“…[6][7][8][9][10] By contrast with traditional solar cells, the mechanism of the photovoltaic effect in ferroelectric materials is totally different. The photocurrent in BFO 3 strongly depends on the temperature but only a few studies have investigated in detail the relationships between photocurrent and temperature.…”
mentioning
confidence: 99%
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“…[11] As the performance of an energy harvester is related to its charge density, significant efforts have been made to increase the charge density by means of poling, material selection, architecture optimization, and surface modification. [12,13] More recently, with band bending alteration, the flow direction of optically excited electrons was demonstrated to be controllable in ferroelectric-metal systems, [10,11,[14][15][16] which has further expanded the potential strategies to manipulate the charge density of the materials. However, due to the wide bandgap (2.7-4 eV) of ferroelectric materials, they absorb less than 20% of the solar spectrum, resulting in unfavorable low charge density.…”
mentioning
confidence: 99%