Hydrogenated amorphous silicon oxide(a-SiOx:H) is an attractive passivation material to suppress epitaxial growth and reduce the parasitic absorption loss in silicon heterojunction(SHJ) solar cells. In this paper, a-S...Hydrogenated amorphous silicon oxide(a-SiOx:H) is an attractive passivation material to suppress epitaxial growth and reduce the parasitic absorption loss in silicon heterojunction(SHJ) solar cells. In this paper, a-SiOx:H layers on different orientated c-Si substrates are fabricated. An optimal effective lifetime(τ(eff)) of 4743 μs and corresponding implied opencircuit voltage(iV(oc)) of 724 mV are obtained on〈100〉-orientated c-Si wafers. While τ(eff) of 2429 μs and iV_(oc) of 699 mV are achieved on 111-orientated substrate. The FTIR and XPS results indicate that the a-SiOx:H network consists of SiOx(Si-rich), Si–OH, Si–O–SiHx, SiO2 ≡ Si–Si, and O3 ≡ Si–Si. A passivation evolution mechanism is proposed to explain the different passivation results on different c-Si wafers. By modulating the a-SiOx:H layer, the planar silicon heterojunction solar cell can achieve an efficiency of 18.15%.展开更多
In this study,a method for optical simulation of external quantum efficiency(EQE)spectra of solar cells based on spectroscopy is proposed,which is based on the tested transmittance and reflectance spectra.First,to obt...In this study,a method for optical simulation of external quantum efficiency(EQE)spectra of solar cells based on spectroscopy is proposed,which is based on the tested transmittance and reflectance spectra.First,to obtain a more accurate information of refractive index and extinction coefficient values,we modified the reported optical constants from the measured reflectance and transmittance spectra.The obtained optical constants of each layer were then collected to simulate the EQE spectra of the device.This method provides a simple,accurate and versatile way to obtain the actual optical constants of different layers.The EQE simulation approach was applied to the flat and textured heterojunctions with intrinsic layers(HIT)solar cells,respectively,which showed a perfect matching between the calculation results and the experimental data.Furthermore,the specific optical losses in different devices were analyzed.展开更多
基金Project supported by the National Key Research and Deveopment Program of China(Grant No.2018YFB1500402)the National Natural Science Foundation of China(Grant Nos.61674084 and 61874167)+5 种基金the Fundamental Research Funds for Central Universities,Chinathe Natural Science Foundation of Tianjin City,China(Grant No.17JCYBJC41400)the Open Fund of the Key Laboratory of Optical Information Science&Technology of Ministry of Education of China(Grant No.2017KFKT014)the 111 Project,China(Grant No.B16027)the International Cooperation Base,China(Grant No.2016D01025)Tianjin International Joint Research and Development Center,China。
文摘Hydrogenated amorphous silicon oxide(a-SiOx:H) is an attractive passivation material to suppress epitaxial growth and reduce the parasitic absorption loss in silicon heterojunction(SHJ) solar cells. In this paper, a-SiOx:H layers on different orientated c-Si substrates are fabricated. An optimal effective lifetime(τ(eff)) of 4743 μs and corresponding implied opencircuit voltage(iV(oc)) of 724 mV are obtained on〈100〉-orientated c-Si wafers. While τ(eff) of 2429 μs and iV_(oc) of 699 mV are achieved on 111-orientated substrate. The FTIR and XPS results indicate that the a-SiOx:H network consists of SiOx(Si-rich), Si–OH, Si–O–SiHx, SiO2 ≡ Si–Si, and O3 ≡ Si–Si. A passivation evolution mechanism is proposed to explain the different passivation results on different c-Si wafers. By modulating the a-SiOx:H layer, the planar silicon heterojunction solar cell can achieve an efficiency of 18.15%.
基金supports from National Key Research and Development Program of China (Grant No. 2018YFB1500103)National Natural Science Foundation of China (Grant Nos. 61474065 and 61674084)+2 种基金Tianjin Research Key Program of Science and Technology (Grant No. 18ZXJMTG00220)111 Project (Grant No. B16027)Fundamental Research Funds for the Central Universities
文摘In this study,a method for optical simulation of external quantum efficiency(EQE)spectra of solar cells based on spectroscopy is proposed,which is based on the tested transmittance and reflectance spectra.First,to obtain a more accurate information of refractive index and extinction coefficient values,we modified the reported optical constants from the measured reflectance and transmittance spectra.The obtained optical constants of each layer were then collected to simulate the EQE spectra of the device.This method provides a simple,accurate and versatile way to obtain the actual optical constants of different layers.The EQE simulation approach was applied to the flat and textured heterojunctions with intrinsic layers(HIT)solar cells,respectively,which showed a perfect matching between the calculation results and the experimental data.Furthermore,the specific optical losses in different devices were analyzed.
