Ultraviolet photodetectors (PDs) have been fabricated from p-ZnO:(Li,N)/n-ZnO structures in this Letter. The PDs can operate without any external power supply and show response only to a very narrow spectrum range. The self-power character of the devices is due to the built-in electric field in the p-n junctions that can separate the photogenerated electrons and holes while the high spectrum-selectivity has been attributed to the filter effect of the neutral region in the ZnO:(Li,N) layer. The performance of the self-powered highly spectrum-selective PDs degrades little after five months, indicating their good reliability.

Reliable self-powered highly spectrum-selective ZnO ultraviolet photodetectors

Co-doping: an effective strategy for achieving stable p-type ZnO thin films

Defect luminescence and its mediated physical properties in ZnO

A lithium and nitrogen codoping method has been employed to prepare p-type MgZnO films, and p-MgZnO/i-ZnO/n-ZnO structured light-emitting devices (LEDs) and photodetectors have been fabricated. The LEDs can work continuously for about 97 h under the injection of a 20 mA continuous current, which is the best value ever reported for ZnO-based LEDs. The performance of the photodetectors degrades little after several running cycles. The above results reveal the applicability of the p-MgZnO films in optoelectronic devices.

p-type doping of MgZnO films and their applications in optoelectronic devices.

Raman spectroscopic analysis on Li, N and (Li,N) implanted ZnO

By employing lithium and nitrogen codoping method, p-type zinc oxide (ZnO) films have been prepared, and the p-type conduction can maintain for 207 days. ZnO p-n junctions have been constructed based on the p-type ZnO. Under the drive of continuous current, obvious emission has been observed from the p-n junctions, and the ZnO p-n junction light-emitting devices (LEDs) can still work after placing in air ambient for 180 days. Room temperature electroluminescence spectra of the p-ZnO:(Li, N)/n-ZnO structured LEDs under continuous current recorded intermittently for 180 days. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Liu Ji-Shan

Papers

Stable p-type ZnO films obtained by lithium-nitrogen codoping method