Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion  

作　　者：Yu Cao Xinyun Zhu Xingyu Tong Jing Zhou Jian Ni Jianjun Zhang Jinbo Pang 

机构地区：[1]Key Laboratory of Modem Power System Simulation and Control&Renewable Energy Technology,Northeast Electric Power University,Jilin 132012,China [2]School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China [3]School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,China [4]Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin,Institute of Photo-electronic Thin Film Devices and Technology,College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China [5]Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong,Institute for Advanced Interdisciplinary Research(iAIR),University of Jinan,Jinan 250022,China

出　　处：《Frontiers of Chemical Science and Engineering》2020年第6期997-1005,共9页化学科学与工程前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.51772049);the Jilin Scientific and Technological Development Program,China(Grant No.20170520159JH);the Thirteenth Five-Year'Scientific and Technological Research Project of the Education Department of Jilin Province,China(Grant No.JJKH20190705IG);the project of Jilin Development and Reform Commission(Grant No.2019C042);The authors also show their gratitude to the National Natural Science Foundation of China(Grant No.51802116);the Natural Science Foundation of Shandong Province(No.ZR2019BE M040);Jinbo Pang acknowledges the National Key Research and Development Program of China(Grant No.2017YFE0102700)from the Ministry of Science and Technology(MOST)of China and the Key Research and Development program of Shandong Province(Major Innovation Project of Science and Technology of Shandong Province)(No.2018YFJH0503);the University of Jinan for the Scientific Research Starting Funds.

摘　　要：Thin film solar cells have been proved the next generation photovoltaic devices due to their low cost,less material consumption and easy mass production.Among them,micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiency and ultrathin absorber layers.Yet individual junction devices are limited in photoelectric conversion efficiency because of the restricted solar spectrum range for its specific absorber.In this work,w e designed a nd simulated a multi-junction solar cell with its four sub-cells selectively absorbing the full solar spectrum including the ultraviolet,green,red as well as near infrared range,respectively.B y tuning the G e content,the record efficiency of 24.80%has been realized with the typical quadruple junction structure of a-Si:H/a-Si0.9Ge0.1:H/μc-Si:H/μc-Si0.5Ge0.5:H.To further reduce the material cost,thickness dependent device performances have been conducted.It can be found that the design of total thickness of 4μm is the optimal device design in balancing the thickness a nd the PCE.While the design of ultrathin quadruple junction device with total thickness of 2μm is the optimized device design regarding cost and long-term stability with a little bit more reduction in PCE.These results indicated that our solar cells combine the advantages of low cost and high stability.Our work may provide a general guidance rule of utilizing the full solar spectrum for developing high efficiency and ultrathin multi-junction solar cells.

关 键 词：thin films solar cells quadruple junction solar cell amorphous silicon silicon germanium alloy quantum efficiency 

分 类 号：TM914.4[电气工程—电力电子与电力传动]