Wang Xixi, Liu Zhaolang, Yang Zhenhai, He Jian, Yang Xi, Yu Tianbao, Gao Pingqi, Ye Jichun
Department of physics, Nanchang University, Nanchang, 330031, China.
Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Small. 2018 Apr;14(15):e1704493. doi: 10.1002/smll.201704493. Epub 2018 Feb 28.
Surface nanotexturing with excellent light-trapping property is expected to significantly increase the conversion efficiency of solar cells. However, limited by the serious surface recombination arising from the greatly enlarged surface area, the silicon (Si) nanotexturing-based solar cells cannot yet achieve satisfactory high efficiency, which is more prominent in organic/Si hybrid solar cells (HSCs) where a uniform polymer layer can rarely be conformably coated on nanotextured substrate. Here, the HSCs featuring advanced surface texture of periodic upright nanopyramid (UNP) arrays and hole-conductive conjugated polymers, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), are investigated. The tetramethylammonium hydroxide etching is used to smooth the surface morphologies of the Si-UNPs, leading to reduced surface defect states. The uniform Si-UNPs together with silane chemical-incorporated PEDOT:PSS solution enable the simultaneous realization of excellent broadband light absorption as well as enhanced electrical contact between the textured Si and the conducting polymer. The resulting PEDOT:PSS/Si HSCs textured with UNP arrays show a promising power conversion efficiency of 13.8%, significantly higher than 12.1% of the cells based on the-state-of-the-art surface texture with random pyramids. These results provide a viable route toward shape-controlled nanotexturing-based high-performance organic/Si HSCs.
具有优异光捕获性能的表面纳米纹理有望显著提高太阳能电池的转换效率。然而，由于表面积大幅增加导致严重的表面复合，基于硅（Si）纳米纹理的太阳能电池尚未实现令人满意的高效率，这在有机/硅混合太阳能电池（HSC）中更为突出，在这种电池中，均匀的聚合物层很难在纳米纹理化的基板上均匀涂覆。在此，研究了具有周期性直立纳米金字塔（UNP）阵列和空穴传导共轭聚合物聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）的先进表面纹理的HSC。使用氢氧化四甲铵蚀刻来平滑Si-UNP的表面形貌，从而减少表面缺陷态。均匀的Si-UNP与硅烷化学掺入的PEDOT:PSS溶液能够同时实现优异的宽带光吸收以及纹理化Si与导电聚合物之间增强的电接触。由此产生的具有UNP阵列纹理的PEDOT:PSS/Si HSC显示出有前景的13.8%的功率转换效率，显著高于基于具有随机金字塔的现有表面纹理的电池的12.1%。这些结果为基于形状控制纳米纹理的高性能有机/硅HSC提供了一条可行的途径。
