薄膜太阳能电池中钠离子从钠石灰玻璃和NaF膜向Cu(In,Ga)Se2扩散的控制

Dae‐Hyung Cho, Yong‐Duck Chung, Kyu‐Seok Lee, Ju-hee Kim, Soojeong Park, Jeha Kim
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引用次数: 1

摘要

我们报道了Na掺入Cu(In,Ga)Se2 (CIGS)薄膜太阳能电池的影响。钠离子由不同厚度的NaF薄膜提供,而钠钙玻璃衬底的钠离子则由SiOx屏障的存在或不存在来控制。在CIGS/Mo/SiOx/SLG、CIGS/Mo/SLG、CIGS/ 5nm - naf /Mo/SiOx/SLG、CIGS/ 5nm - naf /Mo/SLG、CIGS/ 15nm - naf /Mo/SiOx/SLG和CIGS/ 15nm - naf /Mo/SiOx/SLG结构中,CIGS中Na含量逐渐增加。随着Na含量的增加,CIGS(112)优先取向生长占优势,而(220/204)优先取向生长基本不变。随着Na含量的增加,晶粒尺寸减小。当Na含量相对较低时,电池效率(η)增加,但由于较厚的NaF与Mo之间的粘附性较差,导致η下降。CIGS/5 nm-NaF/Mo/SiOx/SLG结构样品的峰比(112)/(220/204),晶粒尺寸以及电池性能与CIGS/Mo/SLG结构样品相当,在CIGS中含有相同的Na含量。
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Control of Na diffusion from soda-lime glass and NaF film into Cu(In,Ga)Se2 for thin-film solar cells
We report on the effect of Na incorporation into Cu(In,Ga)Se2 (CIGS) for thin-film solar cells. Na ions were supplied by NaF films with different thicknesses, while those from the soda-lime glass substrate were controlled by a presence or an absence of a SiOx barrier. Gradually increasing a Na content in CIGS was found in the structures of CIGS/Mo/SiOx/SLG, CIGS/Mo/SLG, CIGS/5 nm-NaF/Mo/SiOx/SLG, CIGS/5 nm-NaF/Mo/SLG, CIGS/15 nm-NaF/Mo/SiOx/SLG, and CIGS/15 nm-NaF/Mo/SLG. With increasing the Na content, the CIGS (112) preferential orientation growth became dominant, while the (220/204) one was nearly constant. The grain size decreased with increasing the Na content. The cell efficiency (η) increased for relatively low Na content however the thick NaF led to a degradation of η because of poor adhesion between the CIGS and the Mo. The sample with the CIGS/5 nm-NaF/Mo/SiOx/SLG structure achieved the comparable (112)/(220/204) peak ratios, grain sizes, as well as the cell performances to a CIGS/Mo/SLG structure that contains the same Na content in the CIGS.
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