Balakrishna Ananthoju, Sundara Murthy Mopurisetty, H. Tyagi, D. Bahadur, N. Medhekar, S. Ganguly, M. Aslam
{"title":"Efficiency enhancement in Cu2ZnSnS4 solar cells with silica nanoparticles embedded in absorber layer","authors":"Balakrishna Ananthoju, Sundara Murthy Mopurisetty, H. Tyagi, D. Bahadur, N. Medhekar, S. Ganguly, M. Aslam","doi":"10.1109/PVSC.2015.7355798","DOIUrl":null,"url":null,"abstract":"Light trapping is essential to lower transmission losses in thin-film solar cells, particularly for wavelengths where the absorption is inefficient. We have embedded silica nanoparticles into a CZTS absorber layer resulting in localized as well as scattering field enhancement. UV-Vis absorption measurements show position (depth in the absorber layer) dependent improvement in the optical absorption with incorporation of silica nanoparticles; this has been explained using finite-difference-time-domain (FDTD) calculations of Mie scattering. The optical enhancement in turn leads to efficiency improvement as seen from electrical measurements; this has a slightly different position dependence that can also be understood theoretically. We observe maximal efficiency improvement, of about 21% compared to devices without nanoparticles (reference cell efficiency ~ 4.13% and for particles at middle ~ 5%), when nanoparticles are placed at the middle of the absorber layer.","PeriodicalId":427842,"journal":{"name":"2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2015-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PVSC.2015.7355798","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Light trapping is essential to lower transmission losses in thin-film solar cells, particularly for wavelengths where the absorption is inefficient. We have embedded silica nanoparticles into a CZTS absorber layer resulting in localized as well as scattering field enhancement. UV-Vis absorption measurements show position (depth in the absorber layer) dependent improvement in the optical absorption with incorporation of silica nanoparticles; this has been explained using finite-difference-time-domain (FDTD) calculations of Mie scattering. The optical enhancement in turn leads to efficiency improvement as seen from electrical measurements; this has a slightly different position dependence that can also be understood theoretically. We observe maximal efficiency improvement, of about 21% compared to devices without nanoparticles (reference cell efficiency ~ 4.13% and for particles at middle ~ 5%), when nanoparticles are placed at the middle of the absorber layer.