Issue 4, 2022

Flexible InP–ZnO nanowire heterojunction light emitting diodes

Abstract

Flexible, substrate-free nanowire (NW) devices are desirable to overcome the extremely challenging task of integrating III–V or III–N semiconductor devices such as LEDs and lasers on a range of optoelectronic circuits or biochips. In this work, we report the demonstration of core–shell p-InP/n-ZnO heterojunction NW array LEDs. The emission from the devices consists of three peaks at room temperature due to conduction band-to-heavy hole band transition, conduction band-to-light hole band transition and recombination at the substrate. At 78 K, an additional peak due to Zn acceptor levels is observed, whereas the peak due to the conduction band-to-light hole band transition quenches. Flexible LEDs are then fabricated by embedding the NW arrays in SU-8 to enable subsequent lift-off from the substrate. Compared with the original on-substrate LED device, broader, red-shifted and multiple peaks are observed from the flexible devices, which may be due to non-uniform strain related effects in the NWs caused by the SU-8 film. A slightly higher series resistance as compared to the on-substrate device and significant Joule heating suggest that good heatsinking is required for these flexible devices. Nevertheless, our study paves a promising way towards flexible and low power LEDs.

Graphical abstract: Flexible InP–ZnO nanowire heterojunction light emitting diodes

Supplementary files

Article information

Article type
Communication
Submitted
11 10 2021
Accepted
28 2 2022
First published
28 2 2022

Nanoscale Horiz., 2022,7, 446-454

Flexible InP–ZnO nanowire heterojunction light emitting diodes

N. Gagrani, K. Vora, L. Fu, C. Jagadish and H. H. Tan, Nanoscale Horiz., 2022, 7, 446 DOI: 10.1039/D1NH00535A

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