Core-shell heterojunction solar cells on silicon nanowire arrays

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• 作者：Guobin Jia ; ^{guobin.jia@ipht-jena.de} ; Martin Steglich ; Ingo Sill ; Fritz Falk
• 关键词：Silicon ; Nanowires ; Heterojunction ; a-Si ; Solar cell ; Metal assisted wet chemical etching
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：January, 2012
• 年：2012
• 卷：96
• 期：Complete
• 页码：226-230
• 全文大小：607 K

文摘

Efficient core-shell TCO/a-Si/Si nanowires (SiNWs) heterojunction solar cells were fabricated on SiNW arrays prepared by metal assisted wet chemical etching of an n-type silicon wafer. The silver catalyst was carefully removed after the etching by a three-step procedure. A stack of intrinsic and p-type amorphous-Si (a-Si) was deposited as a shell onto the SiNW arrays by plasma enhanced chemical vapor deposition (PECVD), and finally, a ?00 nm TCO layer was deposited on top of the a-Si layer by atomic layer deposition (ALD). No shunt was detected in our cells, which was a big problem in the cells prepared on similar substrates published in the literature. The core-shell heterojunction solar cells on nanowire arrays also show great improvement of the performance in comparison with those published previously. In a mesa-structured solar cell with contact area of 7 mm², an open circuit voltage of 476 mV, short circuit current density of 27 mA/cm², filling factor of 56.2 % and conversion efficiency of 7.29 % was determined at AM 1.5. Electron beam induced current (EBIC) measurements were performed on the solar cells, which demonstrate unambiguously that the nanowire arrays work as active photovoltaic components.