Optically-addressed two-terminal multicolor photodetector

Abstract

Efficiency enhancement calculations of state-of-the-art solar cells by luminescent layers with spectral shifting, quantum cutting, and quantum tripling function J. Appl. Phys. 114, 084502 (2013); 10.1063/1.4819237 1.5 μm to 0.87 μm optical upconversion using wafer fusion technology

Effects of varying light bias on an optically-addressed two-terminal multicolor photodetector

“…As long as the conditions for single-color detection are met, the detector current increases linearly as the input signal increases over four orders of magnitude [11]. Once the photogenerated current due to the signal is larger than the photogenerated current from the light bias, the detector output saturates due to the constant current of one of the light-biased photodiodes.…”

“…The linear dynamic range for the InGaP photodiode has been investigated under two optical bias levels differing by one order of magnitude [11]. As long as the conditions for single-color detection are met, the detector current increases linearly as the input signal increases over four orders of magnitude [11].…”

“…In addition, a 2.1 V bias across the entire device is used for the Ge photodiode's responsivity to reduce measurement artifacts [9,10]. The linear dynamic range measurement setup is described elsewhere [11]. Fig.…”

Optically addressed near and long-wave infrared multiband photodetectors

“…Optically addressed multiband detectors 21,22 can switch detection bands by external optical bias and can be fabricated by using two terminals (single indium-bump per pixel), which maximizes the pixel fill factor in large infrared (IR) FPAs using small pixel pitch. It also simplifies the read-out integrated circuit (ROIC) for multiband FPA.…”

“…21 The photodetector consisted of a set of p-n junction sub-photodetectors with different cutoff wavelengths and series connected through tunnel junctions. Incident photons pass through all the sub-photodetectors whose bandgaps have higher energies than the photons' and are absorbed by the corresponding sub-photodetector.…”