Broadband Cr3+/(Pr3+/Yb3+) quantum cutting down-conversion system doped in Y2O3/Y3Al5O12 heterostructure thin film

Publication date: 31 March 2016
Source:Thin Solid Films, Volume 603
Author(s): Xiaojie Wu, Zhenzhong Zhang, Fanzhi Meng, Xiaojuan Liu, Xiaodong Niu, Jian Meng
In this work, granular Y2O3/Y3Al5O12(YAG) heterostructure thin films with 100–200nm holes on surface were fabricated by depositing metal yttrium on c-plane sapphire and subsequent thermal anneal. Such Y2O3/YAG thin films are excellent matrix for luminescent materials based on rare earth. Based on this matrix, a Cr³⁺/(Pr³⁺/Yb³⁺) broadband down-converter was fabricated for improving the photovoltaic conversion efficiency of crystalline silicon solar cell (c-Si SC). Cr³⁺ was used to harvest the incident light and sensitize Pr³⁺/Yb³⁺ quantum cutting (QC) couple. QC down-conversion to Yb³⁺ infrared emission was realized in the region of 230nm to 500nm, which approaches the maximum bandwidth of QC down-conversion for c-Si SC.