Monolithic Perovskite-Carrier Selective Contact Silicon Tandem Solar Cells Using Molybdenum Oxide as a Hole Selective Layer

• Published in: Energies Vol. 14; no. 11; p. 3108
• Main Authors: Song, Hoyoung, Lee, Changhyun, Hyun, Jiyeon, Lee, Sang-Won, Choi, Dongjin, Pyun, Dowon, Nam, Jiyeon, Jeong, Seok-Hyun, Kim, Jiryang, Bae, Soohyun, Lee, Hyunju, Kang, Yoonmook, Kim, Donghwan, Lee, Hae-Seok
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 26.05.2021
• Subjects: carrier selective contact; Efficiency; Electrodes; Glass substrates; hole selective layer; Metal oxides; Molybdenum; molybdenum oxide; monolithic tandem cell; perovskite–silicon tandem solar cell; perovskite–silicon tandem solar cell; monolithic tandem cell; carrier selective contact; molybdenum oxide; hole selective layer; Photovoltaic cells; Silicon wafers; T; Technology; United States > US
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en14113108

Monolithic perovskite–silicon tandem solar cells with MoOx hole selective contact silicon bottom solar cells show a power conversion efficiency of 8%. A thin 15 nm-thick MoOx contact to n-type Si was used instead of a standard p+ emitter to collect holes and the SiOx/n+ poly-Si structure was deposited on the other side of the device for direct tunneling of electrons and this silicon bottom cell structure shows ~15% of power conversion efficiency. With this bottom carrier selective silicon cell, tin oxide, and subsequent perovskite structure were deposited to fabricate monolithic tandem solar cells. Monolithic tandem structure without ITO interlayer was also compared to confirm the role of MoOx in tandem cells and this tandem structure shows the power conversion efficiency of 3.3%. This research has confirmed that the MoOx layer simultaneously acts as a passivation layer and a hole collecting layer in this tandem structure.