Helen Park1,Hyunmin Jung1,Geunjin Kim1,Gyeong Sun Jang1,Jihoo Lim2,Moonyong Kim2,Chan Su Moon1,Xiaojing Hao2,Nam Joong Jeon1,Jae Sung Yun2,Jangwon Seo1
Korea Research Institute of Chemical Technology (KRICT)1,University of New South Wales (UNSW)2
Helen Park1,Hyunmin Jung1,Geunjin Kim1,Gyeong Sun Jang1,Jihoo Lim2,Moonyong Kim2,Chan Su Moon1,Xiaojing Hao2,Nam Joong Jeon1,Jae Sung Yun2,Jangwon Seo1
Korea Research Institute of Chemical Technology (KRICT)1,University of New South Wales (UNSW)2
Indium oxide doped with titanium and tantulum with high near-infrared transparency is applied to potentially replace the conventional indium-tin-oxide transparent electrode used in semitransparent perovskite devices and top cells of tandem devices. The high near-infrared transmittance of this electrode is possibly explained by the lower carrier concentration suggesting less defect sites that may sacrifice its optical transparency. Incorporating this electrode to semitransparent perovskite solar cells for both the top and bottom electrodes improved the device performance through possible reduction of interfacial defect sites and modification in energy alignment. Furthermore, applying this multi-doped indium oxide to the semitransparent perovskite top cell in four-terminal perovskite-silicon tandem configurations improved the photocurrent response in the bottom silicon cell by more than 7% and 15% without and with an anti-reflection layer, respectively. Finally, effects on the optical and electrical properties and performance of working devices will be addressed, and the mechanisms involved in the enhanced performance will also be discussed.