Silicon Heterojunction Solar Cells Using Thermally -Evaporated Molybdenum Oxides As Dopant-Free Hole Selective Contact

Ting Yun Yang, Ling Yu Wang, Chien Chi Huang, Shih Wei Chen, Jia Min Shieh, Hsin Fei Meng, Yu Chiang Chao, Peichen Yu

研究成果: 書貢獻/報告類型會議論文篇章

摘要

Dopant-free carrier selective contacts have garnered significant interest for the development of high-efficiency silicon solar cells due to their low-temperature processing and suppression of free-carrier absorption. In this work, we investigate thermally-evaporated molybdenum oxides (MoOx) functioning as a hole-selective contact (HSC) for silicon heterojunction (Si HJT) solar cells. The high work function of MoOx results in upward energy band bending at the MoOx/n-type Si interface, which facilitates the hole transport and blocks the electron. We compare the optical properties of MoOx with different thickness settings of 3, 10, and 15 nm, where the optical bandgap is fitted via the tauc plot and ranging between 3.46, 3.44, and 3.42 eV, respectively. The absorption spectra of MoOx, MoOx with an intrinsic amorphous silicon (a-Si(i)) layer, and sputtered tin-doped indium oxides (ITO) are also presented. The transmission electron microscopy further reveals a 2.8nm-thick silicon oxides layer in between the MoOx and silicon interface. Preliminary results show that the Si HJT cell with a 15 nm-thick MoOx layer achieves a power conversion efficiency (PCE) of 20.3% and an open-circuit voltage (Voc) of 651.9mV, possibly limited by the pyramidal surface morphology and the a-Si(i) interface passivation layer.

原文英語
主出版物標題2021 IEEE 48th Photovoltaic Specialists Conference, PVSC 2021
發行者Institute of Electrical and Electronics Engineers Inc.
頁面863-866
頁數4
ISBN(電子)9781665419222
DOIs
出版狀態已發佈 - 2021 六月 20
事件48th IEEE Photovoltaic Specialists Conference, PVSC 2021 - Fort Lauderdale, 美国
持續時間: 2021 六月 202021 六月 25

出版系列

名字Conference Record of the IEEE Photovoltaic Specialists Conference
ISSN(列印)0160-8371

會議

會議48th IEEE Photovoltaic Specialists Conference, PVSC 2021
國家/地區美国
城市Fort Lauderdale
期間2021/06/202021/06/25

ASJC Scopus subject areas

  • 控制與系統工程
  • 工業與製造工程
  • 電氣與電子工程

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