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A solution-processed high-efficiency p-NiO_n-ZnO heterojunction photodetector.pdf

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A solution-processed high-efficiency p-NiO_n-ZnO heterojunction photodetector

RSC Advances PAPER P u b l i s h e d o n 2 0 J a n u a r y 2 0 1 5 . D o w n l o a d e d b y N o r t h w e s t e r n P o l y t e c h n i c U n i v e r s i t y o n 2 6 / 1 2 / 2 0 1 5 1 3 : 5 2 : 4 1 . View Article Online View Journal | View IssueA solution-proceaMaterials Science and Engineering Divis National Institute of Standards and Tech E-mail: ratan.debnath@ bDepartment of Electrical and Computer Eng Park, MD 20742, USA cN5 Sensors Inc., Rockville, MD 20852, USA dSemiconductor and Dimensional Metro Laboratory, National Institute of Standar 20899, USA eKey Laboratory for the Physics and Chem Beijing, China fInstitute for Research in Electronics and A College Park, MD 20742, USA Cite this: RSC Adv., 2015, 5, 14646 Received 14th November 2014 Accepted 19th January 2015 DOI: 10.1039/c4ra14567d /advances 14646 | RSC Adv., 2015, 5, 14646–1465ssed high-efficiency p-NiO/n-ZnO heterojunction photodetector Ratan Debnath,*a Ting Xie,ab Baomei Wen,ac Wei Li,de Jong Y. Ha,af Nichole F. Sullivan,c Nhan V. Nguyend and Abhishek Motayedaf This paper presents a high efficiency heterojunction p-NiO/n-ZnO thin film ultraviolet (UV) photodetector (PD) fabricated on conductive glass substrates. The devices are fabricated by using a simple spin-coating layer-by-layer method from precursor solutions. Photodiodes show good photoresponse and quantum efficiency under UV illumination. With an applied reverse bias of 1 V, the devices show maximum responsivity and detectivity of 0.28 A W1 and 6.3 1011 Jones, respectively, as well as high gain with external quantum efficiency (EQE) of over 90%. By employing ultrathin Ti/Au as top UV transparent metal contacts, this architecture allows the PDs to be illuminated either through glass or metal side. Laser beam induced current is used to examine the local variation of EQE providing information on the photoresponse behavior within the device. Optical properties of NiO and ZnO deposits have also been explored.1. Introduction Trans