PDF
摘要
以含炭微球作为模板,制备了TiO2纳米晶空洞光阳极用于染料敏化太阳能电池(DSSC),通过调整模板的添加量,实现了空洞数目在光阳极中的调控。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)分析了样品的形貌和结构。结果表明:基于TiO2纳米晶空洞的DSSC,在标准太阳光强度(100mW/cm2)辐照下,最佳的短路电流密度(Jsc)可以达到18.31mA/cm2,开路电压(Voc)为0.701V,填充因子(FF)为0.578,电池效率(PCE)达到7.4%,相比基于TiO2纳米晶的DSSC 4.4%的电池效率,提高了68.18%,其中Jsc的显著提高是电池效率提升的主要因素。光散射、电子寿命的分析表明,适当的空洞结构可以增加光阳极对可见光的散射作用,通过可见光在空洞结构中的多次反射使染料能被多次激发产生光生电子,从而提升了光捕获效率和电子寿命,最终实现了DSSC性能的提高。
Abstract
TiO2 nanocrystalline cavity photoanode was prepared for dye-sensitized solar cells (DSSCs) using carbonaceous microspheres as templates.The number of cavities in the TiO2 nanocrystalline photoanode could be controlled by adjusting the amount of carbonaceous microspheres.The morphology and crystalline structure of the samples were analyzed by scanning electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray diffraction (XRD).The results showed that DSSC based on TiO2 nanocrystalline cavities,under the irradiation of standard sunlight intensity (100mW/cm2),achieved the optimal short-circuit current density (Jsc) of 18.31mA/cm2,an open circuit voltage (Voc) of 0.701V,a filling factor (FF) of 0.578,and a power conversion efficiency (PCE) of 7.4%.In comparison with the 4.4% cell efficiency of DSSC based on TiO2 nanocrystalline,the PCE was increased by 68.12%,where the significant increase of Jsc was the main factor for the cell efficiency improvement.The analysis of light scattering and electron lifetime revealed that appropriate number of cavities in photoanode could enhance light scattering effect by multiple reflections of visible light and multiple excitations of dyes in the cavity structure to produce photogenerated electrons,which improved the light capture efficiency and electron lifetime,and finally led to the enhancement of DSSC performance.
关键词
染料敏化太阳能电池
/
纳米晶空洞
/
光阳极
/
含碳微球
Key words
dye-sensitized solar cell
/
nanocrystalline cavities
/
photoanode
/
carbonaceous microspheres
TiO2纳米晶空洞光阳极在染料敏化太阳能电池中的光电增效性能研究[J].
化工新型材料, 2024, 52(2): 115-119 DOI:10.19817/j.cnki.issn1006-3536.2024.02.027
[1] Grätzel M.Photoelectrochemical cells[J].Nature,2001,414(15):338-344.
[2] Devadiga D,Selvakumar M,Shetty P,et al.Recent progress in dye sensitized solar cell materials and photo-supercapacitors:a review[J].Journal of Power Sources,2021,493:229698.
[3] Muñoz-García A B,Benesperi I,Boschloo G,et al.Dye-sensitized solar cells strike back[J].Chemical Society Reviews,2021,50:12450-12550.
[4] Zhijun N,Ying F,He T.Improvement of dye-sensitized solar cells:what we know and what we need to know[J].Energy & Environmental Science,2010,3(9):1170-1181.
[5] 黄欢,魏玉龙,包春雄,等.改进型溶胶-凝胶法制备粒径可调高染料吸附量TiO2微球及其在染敏电池光散射层中的应用[J].无机化学学报,2013,29(10):2169-2175.
[6] Qiang L,Jinying W.Dye-sensitized solar cells based on surficial TiO2 modification[J].Solar Energy,2019,184:454-465.
[7] 楚婉怡,唐笑,李振,等.液相合成超薄TiO2纳米片微结构影响因素研究[J].化学学报,2018,76(7):549-555.
[8] 朱清,李成胜,鲍雨,等.TiO2空心微球在NaYF4:Yb3+,Er3+/商业TiO2染料敏化太阳能电池中的应用[J].化工新型材料,2021,49(2):218-222.
[9] Libo Y,Zhen L.Building triple shelled ZnO hollow microspheres decorated TiO2 nanotree to boost light harvesting and reduced charges recombination in dye sensitized solar cell[J].Materials Science in Semiconductor Processing,2022,149:106881.
[10] 郭薇,王开,沈艺花,等.简易模板剂法制备多级介孔TiO2微球及其在染料敏化太阳能电池中的性能[J].物理化学学报,2013,29(1):82-88.
[11] 朱清,土洛,周幸福.TiO2纳米微球的制备及在染料敏化太阳能电池中的应用[J].无机化学学报,2016,32(8):1319-1326.
[12] Ohtani B,Prieto-Mahaney O O,Li,D,et al.What is Degussa (Evonik) P25？crystalline composition analysis,reconstruction from isolated pure particles and photocatalytic activity test[J].Journal of Photochemistry and Photobiology A:Chemistry,2010,216(2):179-182.
[13] Song Han,Lin Yu,Zhang Zhengyan,et al.Improving the efficiency of quantum dot sensitized solar cells beyond 15% via secondary deposition[J].Journal of the American Chemical Society,2021,143(12):4790-4800.
基金资助
国家自然科学基金地区基金项目(51862007);中科院西部之光青年学者项目(中科院人字(2022)4号);甘肃省青年博士基金项目(2022QB-156);甘肃省陇原青年创新创业人才项目(甘组通字(2021)17号)
