Abstract
Up-converted heterostructures with a Mn-doped GaN intermediate band photodetection layer and an InGaN/GaN multiple quantum well (MQW) luminescence layer grown by metal-organic vapor-phase epitaxy are demonstrated. The up-converters exhibit a significant up-converted photoluminescence (UPL) signal. Power-dependent UPL and spectral responses indicate that the UPL emission is due to photo-carrier injection from the Mn-doped GaN layer into InGaN/GaN MQWs. Photons convert from 2.54 to 2.99 eV via a single-photon absorption process to exhibit a linear up-conversion photon energy of ~450 meV without applying bias voltage. Therefore, the up-conversion process could be interpreted within the uncomplicated energy level model.
Highlights
Various attempts have been made to improve the efficiency of solar cells by exploiting intermediate band absorption and up-conversion effects
Up-converted heterostructures with a Mn-doped GaN intermediate band photodetection layer and an InGaN/GaN multiple quantum well (MQW) luminescence layer grown by metal-organic vaporphase epitaxy are demonstrated
Power-dependent upconverted photoluminescence (UPL) and spectral responses indicate that the UPL emission is due to photo-carrier injection from the Mn-doped GaN layer into InGaN/GaN MQWs
Summary
Various attempts have been made to improve the efficiency of solar cells by exploiting intermediate band absorption and up-conversion effects These processes transform additional low-energy photons in the solar spectrum into high-energy ones [1,2,3,4,5,6]. The up-conversion photoluminescence (UPL) phenomenon requires a mechanism that up-converts electrons and/or holes from the low- to the high-band-gap material. The up-converters consisted of Mn-doped GaN intermediate band materials for photodetection, and InGaN/GaN multiple quantum well (MQW) structures for radiative luminescence. The UPL was mainly attributed to the fact that low-energy photons generated electrons from the Mn-doped GaN layer. These photons were injected into the InGaN/GaN MQWs, leading to the UPL.
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