为了减少单晶硅太阳电池的光学损失,需在硅片表面制备大小合适且分布均匀致密的金字塔结构。基于此目的,在一步制绒基础上开发出两步制绒工艺,即原硅片依次经过两个化学溶液配比不同、反应时间不同的制绒槽。第1个槽药液浓度较高,化学反应速率较快,金字塔能够快速成核生长;第2个槽药液浓度较低,化学反应速率较慢,从而获得结构独立且均匀性较好的金字塔。实验表明：第1个槽的最佳反应时间在250~300 s,第2个槽的最佳反应时间在100~130 s。相对于一步制绒工艺,两步制绒工艺形成的硅片表面反射率降低0.5%,增加了表面对光的吸收,可使太阳电池获得更高的光电转换效率。
Abstract
In order to reduce optical losses in monocrystalline silicon solar cells, it is necessary to obtain a uniform and dense pyramidal structure on the surface of the crystalline silicon. A two-step texturing process has been developed for this purpose, whereby the wafers are sequentially passed through two texturing tanks with different chemical solution ratios and different reaction times. The first tank has a higher concentration of the chemical solution and a faster reaction rate, resulting in fast nucleation of the pyramids; the second tank has a lower concentration of the chemical solution and a slower reaction rate, resulting in structurally independent and homogeneous pyramids. Experiments show that the optimum reaction time is 250-300 s for the first step texturing and 100-130 s for the second step texturing, and that the surface reflectivity of the wafers formed by the two-step texturing is reduced by 0.5% compared to the one-step texturing, which increases the absorption of light by the wafer and enables the solar cell to achieve higher photoelectric conversion efficiency.
关键词
太阳电池 /
制绒 /
反射率 /
电性能参数 /
量化表征 /
量子效率
Key words
solar cells /
texturing /
reflectivity /
photovoltaic parameter /
quantitative characterization /
quantum efficiency
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] MA X, LIU Z M, LIAO H, et al.Surface texturisation of monocrystalline silicon solar cells[C]//2011 Asia-pacific Power and Energy Engineering Conference, Wuhan, China, 2011: 1-4.
[2] CHEN K X, LIU Y Y,WANG X S, et al.Novel texturing process for diamond-wire-sawn single-crystalline silicon solar cell[J]. Solar energy materials and solar cells, 2015,133: 148-155.
[3] AKILA B S, VAITHINATHAN K, BALAGANAPATHI T, et al.Investigations on the correlation between surface texturing histogram and the spectral reflectance of (100) crystalline silicon substrate textured using anisotropic etching[J]. Sensors and actuators A: physical, 2017, 263: 445-450.
[4] PARK H, KWON S, LEE J S, et al.Improvement on surface texturing of single crystalline silicon for solar cells by saw-damage etching using an acidic solution[J]. Solar energy materials and solar cells, 2009, 93(10): 1773-1778.
[5] BASU P K, SARANGI D, SHETTY K D, et al.Liquid silicate additive for alkaline texturing of mono-Si wafers to improve process bath lifetime and reduce IPA consumption[J]. Solar energy materials and solar cells, 2013, 113: 37-43.
[6] BASU P K, KHANNA A, HAMEIRI Z.The effect of front pyramid heights on the efficiency of homogeneously textured inline-diffused screen-printed monocrystalline silicon wafer solar cells[J]. Renewable energy, 2015, 78: 590-598.
[7] XU Z L,XU X P,CUI C C, et al.A new uniformity coefficient parameter for the quantitative characterization of a textured wafer surface and its relationship with the photovoltaic conversion efficiency of monocrystalline silicon cells[J]. Solar energy, 2019, 191: 210-218.
[8] 张嘉华. 单晶硅制绒工艺探究[D]. 金华: 浙江师范大学, 2021.
ZHANG J H.Research on monocrystalline silicon texturing process[D]. Jinhua: Zhejiang Normal University, 2021.
[9] 方正. 单晶硅太阳能电池表面织构对其光电特性的影响研究[D]. 厦门: 集美大学, 2020.
FANG Z.Research on the influence of surface texture on the photoelectric characteristics of monocrystalline silicon solar cell[D]. Xiamen: Jimei University, 2020.
[10] 吴江宏, 胡社军, 王忆, 等. 单晶硅太阳电池表面绒面制备及其性质研究[J]. 化工技术与开发, 2010, 38(8): 5-10.
WU J H, HU S J, WANG Y, et al.Study on surface texturization and properties of monocrystalline silicon-based solar cells[J]. Technology & development of chemical industry, 2010, 38(8): 5-10.
基金
河南省中国科学院科技成果转移转化项目（2020108）
PDF(2481 KB)
