A multiband NIR upconversion core-shell design for enhanced light harvesting of silicon solar cells  

作　　者：Yue Wang Wen Xu Haichun Liu Yuhan Jing Donglei Zhou Yanan Ji Jerker Widengren Xue Bai Hongwei Song 

机构地区：[1]State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,130012 Changchun,China [2]Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission,School of Physics and Materials Engineering,Dalian Minzu University,Dalian 116600,China [3]Department of Applied Physics,KTH Royal Institute of Technology,SE-10691 Stockholm,Sweden

出　　处：《Light(Science & Applications)》2024年第12期3261-3271,共11页光(科学与应用)(英文版)

基　　金：supported by the National Key R&D Program of China(2021YFB3500403);National Natural Science Foundation of China(Grant Nos.12374379,12174152,62222502,62175025);Natural Science Foundation of Jilin Province(202513JC010277746);Outstanding Young Talents from Xingliao of Liaoning(Grant No.XLYC2203170);support from the Swedish Foundation for Strategic Research(SSF,BENVAC RMX18-0041)and theÅForsk Foundation(23-322).

摘　　要：Exploring lanthanide light upconversion(UC)has emerged as a promising strategy to enhance the near-infrared(NIR)responsive region of silicon solar cells(SSCs).However,its practical application under normal sunlight conditions has been hindered by the narrow NIR excitation bandwidth and the low UC efficiency of conventional materials.Here,we report the design of an efficient multiband UC system based on Ln^(3+)/Yb^(3+)-doped core-shell upconversion nanoparticles(Ln/Yb-UCNPs,Ln^(3+)=Ho^(3+),Er^(3+),Tm^(3+)).In our design,Ln^(3+)ions are incorporated into distinct layers of Ln/Yb-UCNPs to function as near-infrared(NIR)absorbers across different spectral ranges.This design achieves broad multiband absorption withtin the 1100 to 2200 nm range,with an aggregated bandwidth of~500 nm.We have identified a synthetic electron pumping(SEP)effect involving Yb^(3+)ions,facilitated by the synergistic interplay of energy transfer and cross-relaxation between Yb^(3+)and other ions Ln^(3+)(Ho^(3+),Er^(3+),Tm^(3+)).This SEP effect enhances the UC efficiency of the nanomaterials by effectively transferring electrons from the low-excited states of Ln^(3+)to the excited state of Yb^(3+),resulting in intense Yb^(3+)luminescence at~980 nm within the optimal response region for SSCs,thus markedly improving their overall performance.The SSCs integrated with Ln/Yb-UCNPs with multiband excitation demonstrate the largest reported NIR response range up to 2200 nm,while enabling the highest improvement in absolute photovoltaic efficiency reported,with an increase of 0.87%(resulting in a total efficiency of 19.37%)under standard AM 1.5 G irradiation.Our work tackles the bottlenecks in UCNP-coupled SSCs and introduces a viable approach to extend the NIR response of SSCs.

关 键 词：excited excitation ABSORBER 

分 类 号：O61[理学—无机化学]