Gamma‐ray tolerance of CdS/CdTe photodiodes for radiation tolerant compact image sensor with field emitter array

Abstract

The effect of gamma irradiation on two types (superstrate‐ and substrate‐type) of CdS/CdTe photodiodes, which we have proposed as potential photoconducting films for compact image sensors with a field emitter array (FEA), was investigated. A 60Co gamma‐ray source was employed, and the total gamma irradiation dose was more than 500 kGy. For the superstrate‐type structure, the irradiation caused the short‐circuit current density (JSC) to decrease, probably due to the resulting decreased transmittance of the glass substrate. On the other hand, little degradation of the I ‐V characteristics or spectral response was observed after the gamma irradiation for the substrate‐type structure. These results suggest that, taking into account the decrease in transmittance of the glass substrate, the CdS/CdTe photodiodes have sufficient tolerance to high gamma‐ray exposure. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Gamma-ray irradiation effects on CdTe solar cell dosimeter

“…The value of short current density (J SC ) decreased in the early stage of the dose. 22,23) After the first dose (75 kGy), the coloring of the glass substrate due to γ-ray absorption was observed. 22,23) We concluded that the decrease was due to the decrease in transmittance of the glass substrate.…”

“…22,23) After the first dose (75 kGy), the coloring of the glass substrate due to γ-ray absorption was observed. 22,23) We concluded that the decrease was due to the decrease in transmittance of the glass substrate. Furthermore, open circuit voltage (V OC ) slightly decreased.…”

“…[11][12][13] In addition, because CdTe is used in radiation detectors, we also expect CdTe solar cells to have a high tolerance to radiation. [13][14][15][16][17][18][19][20][21][22][23] In this work, we investigated the effects of γ-ray irradiation on polycrystalline CdTe thin-film solar cells. In this paper, in addition to the previously published abstract 24) on the γ-ray tolerance, and the high dose rate γ-ray detection in the CdTe solar cells, we described the improvement of γ-ray sensitivity by stacking ten cells and connecting them in parallel, and the γ-ray detection under high flux neutron environment.…”

Visible to Near‐Infrared Photodiodes with Advanced Radiation Resistance

“…[ 47 ] CdTe‐based thin‐film solar cells and photodiodes efficiently tolerate high gamma‐ray and proton exposures. [ 48–52 ]…”

Pixelated Vacuum Flat Panel Detector Using ZnS Photoconductor and ZnO Nanowires Cold Cathode

“…In recent years, vacuum devices are also studied for photodetection due to the advantages of high-sensitivity and high resistance to radiation [ 25 ]. The main structure of vacuum photodetectors includes a photoconductor anode and a cold cathode field emitter array (FEA), which can be made into a large-area flat panel detector.…”