Texture engineering of mono-crystalline silicon via alcohol-free alkali solution for efficient PERC solar cells  

作　　者：Danni Zhang Jiawang Chen Rui Jia Zhibo Gao Ke Tao Longjie Wang Huayun Ge Xinpu Li Xing Li 

机构地区：[1]Institute of Microelectronics of Chinese Academy of Sciences,Beijing 100029,China [2]University of Chinese Academy of Sciences,Beijing 100029,China [3]Hanwha-Qcells,Nantong 226200,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2022年第8期104-107,I0021-I0025,I0004,共10页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2018YFB1500500,2018YFB1500200,2020YFB1506503);the National Natural Science Foundation of China(12035020,52072399,62074165,12175305,62104253 and 12105357);the Natural Science Foundation of Beijing Municipality(4192064,1212015)。

摘　　要：Control of texture structures is an effective method to reduce surface reflectivity and enhance the efficiency of solar cells.In this paper,pyramid structures are prepared on mono-crystalline silicon wafers by cyclodextrin as surfactant to slow down the etching rate in alcohol-free alkali solution.Compared with volatile alcohol surfactant(e.g.isopropanol,IPA),the cyclodextrin not only possesses a relative high boiling point(1534.4℃),but displays non-toxic and biodegradable properties.Furthermore,the surface morphology,average reflectivity,surface recombination of mono-crystalline silicon wafers were studied in detail.The results show that cyclodextrin can decrease the size and depth of pyramid structures,and thus a lower average reflectivity of 7.5%was obtained.In addition,ray tracing simulation was performed to calculate the photo-generated carrier concentration of PN junction with different sizes of pyramids,and the conclusion is that the carrier concentration of small pyramids is much higher than that of large pyramids.Finally,the average efficiency of large-area mono-crystalline silicon PERC solar cells fabricated by cyclodextrin surfactant was 22.69%,which was 0.43%absolutely higher than that of conventional IPA surfactant.

关 键 词：Texture engineering PERC solar cells PYRAMIDS Efficiency Cyclodextrin surfactant 

分 类 号：TQ127.2[化学工程—无机化工] TM914.4[电气工程—电力电子与电力传动]