纳米MgO对ZnO紫外光电转换涂层中载流子复合的抑制作用  

Suppression Effect of MgO Nanoparticles on Carrier Recombination in ZnO Ultraviolet Photoelectric Conversion Coatings

作　　者：仝钰枫 曾世杰 杨洪旺 温才[1] 唐金龙[1] 陈敏 李晓宇 徐状 魏源 任勇 TONG Yufeng;ZENG Shijie;YANG Hongwang;WEN Cai;TANG Jinlong;CHEN Min;LI Xiaoyu;XU Zhuang;WEI Yuan;REN Yong(School of Mathematics and Physics,Southwest University of Science and Technology,Mianyang 621010,China;Ninth Research Institute,China Electronics Technology Group Corporation,Mianyang 621000,China;State Key Laboratory of Environment‒friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学数理学院,绵阳621010 [2]中国电子科技集团公司第九研究所,绵阳621000 [3]西南科技大学环境友好能源材料国家重点实验室,绵阳621010

出　　处：《光子学报》2024年第12期164-174,共11页Acta Photonica Sinica

基　　金：中国电子科技集团公司第九研究所对外开放项目(No.2024SK-001-5);四川省自然科学基金杰出青年科学基金(No.24NSFJQ0064);国家自然科学基金(No.51974261)。

摘　　要：利用MgO的钝化作用以抑制ZnO电子传输层中缺陷对载流子的复合。将MgO纳米颗粒掺入ZnO中,制作成含有混合氧化物粉末的悬浊液,将其旋涂在P型钝化发射极背面电池的发射极表面,再通过高温热处理的方式将颗粒固化成涂层。ZnO-MgO纳米颗粒涂层硅基太阳能电池在光照下有更高的短路电流密度。ZnO-MgO纳米颗粒涂层使电池的整体效率从17.10%提高到了19.22%,相比于单ZnO纳米颗粒涂层,对晶硅电池衬底的光电转换效率提升比例增加了4.68%。分析表明,ZnO-MgO纳米颗粒涂层使太阳能电池有更高的载流子浓度,以及在失去光照后更平缓的光电流衰减,表明载流子复合过程受到抑制,同时ZnO-MgO纳米颗粒涂层在织构型发射极表面形成的纳米球状形貌,具有一定的陷光效应,也有助于光吸收的增强和光电转换效率的提高。Mixed oxides are extensively utilized in the solar cell development due to their beneficial properties.For instance,MgO is commonly incorporated into electron transport layers that shows significant carrier recombination,helping to suppress this recombination and enhance the Photoelectric Conversion Efficiency(PCE).Furthermore,ZnO finds the widespread application in sensors and various types of solar cells.In silicon-based solar cells,ZnO nanostructures can enhance the absorption of the blue-ultraviolet spectra,thereby improving their fill factor and PCE.However,the oxygen vacancies(V_(o)^(0),V_(o)^(+),V_(o)^(2+))in ZnO can create recombination centers,negatively affecting its n-type semiconductor properties.Therefore,addressing these defect-induced recombination centers is crucial.This study investigated the incorporation of MgO nanoparticles into ZnO to create a homogeneous mixture.The mixed powder was dispersed in an ethanol solution and subjected to the ultrasonic agitation,resulting in a uniform suspension of the nanoparticles.After adding a small amount of thickening agent,the suspension was spin-coated onto the emitter surface of a p-type Passivated Emitter and Rear Cell(PERC).The nanoparticle coating was then solidified through a high-temperature annealing.To ensure a direct contact between the nanoparticle coating and the emitter,a“semi-finished”PERC cell without a front-side SiNx layer was used as the substrate.This semi-finished cell has a slightly lower PCE of approximately 17.1%compared to the fully finished cells.During the film preparation process,the electrical properties of the mixed nanoparticle coating were optimized using the control variable method.Variables such as the ratio of mixed nanoparticles,the concentration and viscosity of nanoparticles in the spin-coating solution,the spin-coating speed,and the curing temperature were adjusted to address the issue of poor electrical stability in the nanoparticle coating.The current-voltage curves of the solar cell samples,measured before and af

关 键 词：太阳能电池 紫外光电转换 纳米颗粒 ZNO MGO 载流子复合 抑制作用 

分 类 号：O472.3[理学—半导体物理] O472.4[理学—物理]