双面受光铜铟镓硒太阳电池中扩散阻挡层的研究

项目名称： 双面受光铜铟镓硒太阳电池中扩散阻挡层的研究

项目编号： No.51302057

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 万磊

作者单位： 合肥工业大学

项目金额： 25万元

中文摘要： 双面受光铜铟镓硒(CIGS)太阳电池采用透明导电氧化物（TCO）背电极，电池前后两面都可入射太阳光，充分提高了对太阳光的利用率。针对CIGS高温沉积过程中，TCO/CIGS的界面化学反应造成非欧姆接触、降低电池性能的具体科学问题，提出开展TCO背电极超薄扩散阻挡层的研究。本课题以实现TCO背电极与CIGS的准欧姆接触为核心目标，重点研究三元金属硅氮化物扩散阻挡层对TCO/CIGS界面元素互扩散和化学反应的抑制作用，采用同步辐射掠入射X射线衍射、同步辐射光电子能谱等表征手段，研究TCO/扩散阻挡层/CIGS的界面结构、热稳定性、电学性能、光学性能、界面能带结构及其对电池器件性能的影响机制。通过调控三元金属硅氮化物扩散阻挡层的结构和电学性能，优化TCO/扩散阻挡层/CIGS的界面能带结构，提高TCO背电极的载流子收集效率。研究成果对发展双面受光薄膜太阳电池及高效叠层太阳电池具有重要意义。

中文关键词： 铜铟镓硒；双面受光太阳电池；扩散阻挡层；界面相；低熔点吸收层

英文摘要： Bifacial copper indium gallium selenide (CIGS) solar cell using transparent conducting oxide (TCO) back contacts enables us to get electrically illuminated light from both sides of the cell. So the utilization of the sun light will be effectively improved. However, the solar cell performance is deteriorated for higher deposition temperatures which are commonly used for CIGS deposition. This is attributed to diffusion of elements or chemical reaction at the interface region of TCO/CIGS which leads to the non-ohmic contact between the CIGS and TCO. In this project, in order to prevent the diffusion of elements or chemical reaction at the interface region of TCO/CIGS, we propose to develop an ultra-thin diffusion barrier between TCO and CIGS. The primary objective of this project is to establish quasi-ohmic contact between CIGS and TCO. We propose to study the metal-silicon-nitride layer as ultra-thin diffusion barrier to prevent the diffusion of elements and chemical reaction at the interface region. The interface structure, thermal stability, electrical properties, optical properties, interface band structure of TCO/diffusion barrier/CIGS and the effects on solar cell performance will be discussed on the basis of the characterization results from different characterization methods such as grazing incidence X-ray

英文关键词： copper indium gallium selenide；bifacial solar cell；diffusion barrier；interface phase；low melting point absorption layer