Core–Shell Heterojunction Solar Cells Based on Disordered Silicon Nanowire Arrays
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- 作者：Aliénor Svietlana Togonal ; Martin Foldyna ; Wanghua Chen ; Jian Xiong Wang ; Vladimir Neplokh ; Maria Tchernycheva ; Joaquim Nassar ; Pere Roca i Cabarrocas ; Rusli
- 刊名：Journal of Physical Chemistry C
- 出版年：2016
- 出版时间：February 11, 2016
- 年：2016
- 卷：120
- 期：5
- 页码：2962-2972
- 全文大小：714K
- ISSN：1932-7455
文摘
Heterojunction with intrinsic thin layer (HIT) solar cells are still costly due to the use of silicon wafers that contribute to ～30% of the final module cost. To reduce the costs, thinner wafers can be used but to the detriment of the optical absorption. This loss has to be compensated by an efficient light trapping scheme. In this paper we study HIT devices based on Si nanowire (SiNW) core–shell structures to enhance light absorption. The SiNWs are fabricated by a wet etching technique, and the heterojunction is formed using an optimized low-temperature plasma enhanced chemical vapor deposition (PECVD) process at 200 °C. The solar cells are characterized via carrier lifetime and electron beam induced current (EBIC) measurements to understand their electrical properties at nanoscale. The impact of the SiNW length on the cell performance is also investigated. The solar cells show a good performance reaching average fill factor of 81%, <i>Vi>oc of 0.525 V, and <i>Ji>sc of 29.27 mA/cm2 giving rise to an average efficiency of 12.43%. Finally, the fabrication procedure is applied to epitaxial Si thin films, and the performance of such devices is discussed.