N-type bifacial interdigitated-back-contact (IBC) crystalline silicon solar cells were processed with screen-printed electrodes. The bifacial IBC cells resulted in a drastic decrease of the electrical shading loss at the finger region with decreasing pitch on the rear side. This loss was dominated by the width of the base region. In addition, passivation properties also affected carrier recombination in the base region. A narrower base region and smaller pitch led to higher internal quantum efficiency and low series resistance. Cell efficiency of over 22% was obtained for the bifacial IBC crystalline silicon solar cells with a base region width of250 μ m and pitch of1250 μ m. The IQE values above the emitter and base region at medium wavelengths were over 95% and 90%, respectively. Using these cells, a mini-module showing 19.4% module efficiency with 78.1% FF was created.

中文翻译：

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带有丝网印刷电极的双面指状背接触式（IBC）晶体硅太阳能电池的电阴影损失研究

用丝网印刷电极对N型双面指背接触（IBC）晶体硅太阳能电池进行了处理。双面中型散货箱细胞导致手指区域的电阴影损失急剧降低，而后侧的间距减小。该损耗主要由基极区的宽度决定。另外，钝化性质也影响了基区中的载流子复合。较窄的基极区和较小的间距导致较高的内部量子效率和较低的串联电阻。对于具有250μm的基极区宽度和1250μm的节距的双面IBC晶体硅太阳能电池，获得了超过22％的电池效率。在中等波长下，高于发射极和基极区域的IQE值分别超过95％和90％。使用这些单元格，显示一个显示19的微型模块。