Choi, Byung DooPark, JoohyungBaeg, Kang-JunKang, MinjiHeo, Jae SangKim, SeonhyoungWon, JongkookYu, SeungwooAhn, KyunghanLee, Tae HoonHong, JonginKim, Dong-YuUsta, HakanKim, ChoongikPark, Sung KyuKim, Myung-Gil2021-05-252021-05-2520182199-160Xhttps://doi.org/10.1002/aelm.201700386https://hdl.handle.net/20.500.12573/755B.D.C., J.P., and K.-J.B. contributed equally to this work. This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (Nos. NRF-2016K2A9A1A06924256 and NRF-2017R1C1B2005254) and the Technology Innovation Program (No. 10065651) funded by MOTIE/KEIT.Here, the preparation of transparent amorphous oxide semiconductor (AOS) films with unprecedented conductivity via an optimized activation process under hydrogen atmosphere for applications in solution-processed large-area optoelectronics is reported. Owing to their high cost and mechanical vulnerability, conventional vacuum-processed indium-tin oxide (ITO) electrodes are inappropriate for use in next-generation flexible and wearable electronic devices and systems. As an alternative to the ITO electrodes, solution-processed AOS films, such as alpha-IZO and alpha-ZITO, with an optimized composition and postreduction treatment under hydrogen show the highest electrical conductivity of approximate to 300 S cm(-1) and a high optical transmittance of over 90% at 550 nm. The microstructures and electrical properties of these AOS films are also studied in order to determine the optimized chemical composition and postreduction conditions. It is found that a controlled hydrogen reduction treatment of AOS films is critical for achieving high electrical conductivity by suppressing the surface morphology degradation and grain boundary disconnection. Furthermore, the alpha-IZO transparent conductive electrodes are successfully implemented for high efficiency organic photovoltaic cells based on the PTB7/PC71BM active layers. This technique promises the low-cost fabrication of high mobility and/or conductive AOSs for their applications in large-area transparent and flexible optoelectronics.enginfo:eu-repo/semantics/closedAccesstransparent conductive electrodesoxide solution-processingindium-zinc oxideamorphous oxide semiconductorsactivation treatmentsarticleVolume: 41