Improved Photovoltaic Characteristics of Screen-Printed Mono-Crystalline Silicon Solar Cells by Rapid Thermal Annealing Process

Autor: Huai-Wei Huang, 黃懷緯
Rok vydání: 2017
Druh dokumentu: 學位論文 ; thesis
Popis: 105
In this thesis, improved photovoltaic characteristics of screen-printed mono-crystalline silicon solar cells (SPMSSCs) were investigated by the rapid thermal annealing (RTA) process. First, the wet solution process for laser damage removal was demonstrated. Then, the effects of the placed way of the samples, the gas ambient, the temperature, time, the thickness of the nickel, and the wet etching of residual nickel on the quality of the seed layer for electroplated copper were presented. Finally, the copper was electroplated as the rear electrode of the SPMSSCs. The amount of the KOH solution for laser damage removal was achieved. Four placed ways, including the evaporated surface faced to top of the p-type substrate, the evaporated surface faced to top of the p-type substrate was covered by the p-type substrate, the evaporated surface up, as well as the p-type substrate faced to top of the evaporated surface, were addressed. The nitrogen and forming gas (5%H2+95%N2) were used as the process gas. The temperature of the RTA ranged from 325 to 425 oC was achieved. The time of the RTA ranged from 3 to 7 min was explored. The etching time of the SPM solution for residual metal removal was investigated. The results indicate that the increase of the KOH solution amount was help to enhance the conversion efficiency (CE) of the SPMSSCs from 15.2 to 15.8%. Compared with all placed ways, “the evaporated surface faced to top of the p-type substrate was covered by the p-type substrate” was the best condition for CE improvement. The CEs of the SPMSSCs were identical for the nitrogen and forming gas. Thus, the cheap nitrogen gas was used for CE improvement. The achievement of an CE improvement of more than 1.9% absolute from 13.9% to 15.8% in SPMSSCs with the RTA at 350 oC for 5 min was explored.
Databáze: Networked Digital Library of Theses & Dissertations
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