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Significant Passivation Effect of Cu(In, Ga)Se2 Solar Cells via Back Contact Surface Modification Using Oxygen Plasma
Solar RRL ( IF 6.0 ) Pub Date : 2020-12-17 , DOI: 10.1002/solr.202000572 Longlong Zeng 1 , Chunhong Zeng 1 , Yunfeng Liang 1 , Ye Yuan 2 , Genghua Yan 2 , Ruijiang Hong 1
Solar RRL ( IF 6.0 ) Pub Date : 2020-12-17 , DOI: 10.1002/solr.202000572 Longlong Zeng 1 , Chunhong Zeng 1 , Yunfeng Liang 1 , Ye Yuan 2 , Genghua Yan 2 , Ruijiang Hong 1
Affiliation
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Molybdenum back contact plays a significant role in chalcopyrite Cu(In, Ga)Se2 (CIGS) solar cells. A molybdenum oxide intermediate layer is applied to optimize the back contact from the aspect of absorber crystal growth regulation and back surface field reconstruction. A novel molybdenum oxide preparation method is introduced through oxygen plasma treatment of the molybdenum layer. CIGS film is obtained by sputtering from a quaternary target with post‐selenization. The shortage of Cu and Se in the middle of the absorption layer causes crystallization stratification. A bidirectional regulation method for controlling intermediate fine grains is proposed. Superior crystallinity is produced to facilitate carriers’ transport and reduce recombination at grain boundaries. Back passivation is achieved by forming a reverse p–n junction on the back surface. Despite the formation of this reverse junction, the efficiency of the device is still improved because the transport of holes is assisted by the molybdenum oxide's gap states. Thus, back surface recombination is effectively reduced by back passivation, leading to the increase in open‐circuit voltage (Voc) and fill factor (FF). The power conversion efficiency of treated solar cells increases by 34.1%. An innovative direction is proposed to optimize the back contact of CIGS solar cells in this study.
中文翻译：
Cu（In，Ga）Se2太阳能电池通过氧等离子体的背接触面改性对钝化效果显着
钼背接触在黄铜矿Cu（In，Ga）Se 2中起重要作用（CIGS）太阳能电池。从吸收体晶体生长调节和背面场重建的角度出发，应用氧化钼中间层来优化背接触。通过对钼层进行氧等离子体处理，提出了一种新颖的氧化钼制备方法。CIGS膜是通过从硒化后的四元靶溅射获得的。吸收层中间的Cu和Se的缺乏导致结晶分层。提出了一种控制中间细晶粒的双向调节方法。产生了出色的结晶度，以促进载流子的运输并减少晶界处的复合。背面钝化是通过在背面形成反向p–n结来实现的。尽管形成了反向结，器件的效率仍然得到提高，因为空穴的输送是由氧化钼的间隙状态所辅助的。因此，通过背面钝化可以有效地减少背面的重组，从而导致开路电压的增加（V oc）和填充系数（FF）。经过处理的太阳能电池的功率转换效率提高了34.1％。在这项研究中，提出了一个创新方向来优化CIGS太阳能电池的背接触。
更新日期：2020-12-17
中文翻译：
Cu（In，Ga）Se2太阳能电池通过氧等离子体的背接触面改性对钝化效果显着
钼背接触在黄铜矿Cu（In，Ga）Se 2中起重要作用（CIGS）太阳能电池。从吸收体晶体生长调节和背面场重建的角度出发，应用氧化钼中间层来优化背接触。通过对钼层进行氧等离子体处理，提出了一种新颖的氧化钼制备方法。CIGS膜是通过从硒化后的四元靶溅射获得的。吸收层中间的Cu和Se的缺乏导致结晶分层。提出了一种控制中间细晶粒的双向调节方法。产生了出色的结晶度，以促进载流子的运输并减少晶界处的复合。背面钝化是通过在背面形成反向p–n结来实现的。尽管形成了反向结，器件的效率仍然得到提高，因为空穴的输送是由氧化钼的间隙状态所辅助的。因此，通过背面钝化可以有效地减少背面的重组，从而导致开路电压的增加（V oc）和填充系数（FF）。经过处理的太阳能电池的功率转换效率提高了34.1％。在这项研究中，提出了一个创新方向来优化CIGS太阳能电池的背接触。
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