丝网印刷局域背电极接触低串联电阻研究

Study on Lowering the Series Resistance of Local Contact Cell with Screen Printing Method

摘要: 该文采用丝网印刷方式制备常规铝背场(Al-BSF)太阳电池及局域背电极接触太阳电池(LCC)，转换效率(η)分别为17.44%和8.95%。LCC串联电阻(R_s)为21.34 mΩ，是转换效率低的主要原因。该文在1000 W/m²及500 W/m²光照条件下，以双曲线法监测LCC的串联电阻，研究铝(Al)掺杂对转换效率的影响。随着Al掺杂量逐渐增加串联电阻逐渐减小，当Al掺杂量达60%时，串联电阻达到最小，比掺杂前降低11 mΩ，转换效率提升2.59% (abs.)。随Al掺杂量不断增加，开路电压(V_oc)持续提高，但掺杂量过高(>60%)会造成串联电阻增加，降低转换效率。

Abstract: Aluminum back surface field (Al-BSF) and local contact cells (LCC) are obtained by screen printing method. The conversion efficiency (η) of Al-BSF solar cells is 17.44%. The conversion efficiency of LCC is only 8.95% because of the poor series resistance (R_s) which is eight times higher than that of Al-BSF. The series resistance is measured under two different incident power of 1000 W/m² and 500 W/m² at 25˚C, AM1.5. The results of this paper show that the series resistance decreases with Aluminum (Al) dopant. It reaches the minimum when the Al content is in the vicinity of 60%. It decreases by 11 mΩ. And the conversion efficiency rises 2.59%. Although the open circuit voltage (V_oc) is still improved, both the series resistance and the conversion efficiency degrade with Al in-creasing if Al content is higher than 60%.