量子點和金屬增益螢光材料在提升單晶矽太陽能電池之應用

Abstract

本實驗的主要目的是利用不同形式的螢光材料，量子點CdTe及添加金屬增益螢光效應的奈米螢光粉Ba2SiO4:7%Eu2+，塗佈在單晶矽電池上，將太陽光譜紫外波段轉換成可見光，嘗試提升單晶矽太陽能電池的整體效率。 其中量子點CdTe的塗佈，因為增加了紫外光波段的光轉換及降低可見光波段的反射率，效率由18.18％增加為18.47％，增加的來源來自於短路電流的提升。 而添加金屬增益螢光效應的螢光粉Ba2SiO4:7%Eu2+的在單晶矽電池上，發現可以改善原先螢光粉Ba2SiO4:7%Eu2+在可見光波段的反射，並進一步提升在紫外光波段的外部量子效率。效率由18.16％增加為18.69％，增加的來源來自於短路電流的提升。

Recently, methods to enhance the short-wavelength (λ) spectral response and overall conversion efficiency have been investigated by several groups. This thesis aims to enhance the down-shifting phenomena of solar cells. The content is divided into two parts：(1) Quantum dots CdTe (2) Rare earth-doped nano phosphor Ba2SiO4:7%Eu2+ with metal-enhanced fluorescence.

Part one：With spinning coating of quantum dots CdTe on monocrystalline solar cells, the efficiency was found to increase from 18.18％ to 18.47％ due to the down-shifting in the ultra violet(UV) region and anti-reflection in the visible region. Part two：Fabricating Ba2SiO4:7%Eu2+ with metal-enhanced fluorescence on monocrystalline solar cells, the efficiency can be further and remarkably enhanced by spin-on Ag particle with a 20-nm-thick SiO2 layer as a dielectric medium. Therefore, this work provides a facile approach for the fabrication of metal-enhanced fluorescence, which can improve the emission of nano phosphor and reduce the reflection in the visible region of solar cell.