CdSe@CdTe核壳II型量子点掺杂的薄膜太阳能电池  

Synthesis of type II CdSe@CdTe core-shell nanocrystal and their photovoltaic characterization

作　　者：管秋梅[1] 

机构地区：[1]东南大学电工电子实验中心,江苏南京210096

出　　处：《电子元件与材料》2014年第10期27-31,共5页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.10774023)

摘　　要：采用胶体化学法制备了CdSe@CdTe核壳量子点,将其置于CdTe量子点层与CdSe量子点层间构筑了三层结构的全无机薄膜太阳能电池(ITO/CdTe/CdSe@CdTe/CdSe/Al),在电池制备过程中对量子点薄膜进行了退火处理。吸收光谱、荧光光谱及荧光寿命测试结果表明所制备的CdSe@CdTe量子点为典型的II型量子点。其光电转换性能测量结果表明所制太阳能电池具有高达0.48%的能量转换效率,这主要得益于三层量子点间能带能量的差异对电子与空穴的定向传输的促进以及退火工艺对薄膜结晶质量的改善。CdSe@CdTe core-shell quantum dots were prepared through the colloid chemical method. All inorganic thin film solar cells with a three-layer structure（ITO/CdTe/CdSe@CdTe/CdSe/Al） were prepared by inserting the prepared core-shell quantum dots between CdTe and CdSe quantum dots layers. During the preparation process of solar cells, as-prepared quantum dots films were annealed. The measurement results of absorption spectrum, photoluminescence（PL） spectrum, and PL lifetime confirm a typical type II quantum dots for as-prepared CdSe@CdTe quantum dots. The measurement result of photoelectric conversion characteristic show that the power conversion efficiency（PCE） of the solar cells is up to 0.48%, which is attributed to the following two aspects, the difference of bandgap energy between three quantum layers can promote the directed transportation of electrons and holes, the crystallinity of the film is effectively improved by annealing.

关 键 词：胶体化学法 Ⅱ型量子点 荧光寿命 全无机薄膜太阳能电池 三层结构 CdSe@CdTe 

分 类 号：TN303[电子电信—物理电子学]