期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 20, 页码 13018-13026出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03258
关键词
Sb-doped ZnO; p-type ZnO; ZnO homojunction; low-temperature solution process; light-emitting diode
资金
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MI, Korea) [10051207]
- LG Display academic industrial cooperation program
This study explores low-temperature solution process-based seed-layer-free ZnO p-n homojunction light emitting diode (LED). In order to obtain p-type ZnO nanodisks (NDs), antimony (Sb) was doped into ZnO by using a facile chemical route at 120 degrees C. The X-ray photoelectron spectra indicated the presence of (Sb-Zn-2V(Zn).) acceptor complex in the Sb-doped ZnO NDs. Using these NDs as freestanding templates, undoped n-type ZnO nanorods (NRs) were epitaxially grown at 95 degrees C to form ZnO p-n homojunction. The homojunction with a turn-on voltage of 2.5 V was found to be significantly stable up to 100 s under a constant voltage stress of 5 V. A strong orange-red emission was observed by the naked eye under a forward bias of 5 V. The electroluminescence spectra revealed three major peaks at 400, 612, and 742 nm which were attributed to the transitions from Zn-i to VBM, from Zn-1 to O-i, and from V-O to VBM, respectively. The presence of these deep-level defects was confirmed by the photoluminescence of ZnO NRs. This study paves the way for future applications of ZnO homojunction LEDs using low-temperature and low-cost solution processes with the controlled use of native defects.
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