项目名称： 硫系薄膜中体相异质结网络的晶化方法构筑及其光伏特性研究

项目编号： No.61504085

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 樊博

作者单位： 深圳大学

项目金额： 20万元

中文摘要： 在薄膜太阳能电池中构筑体相异质结网络结构是研制廉价、高效光伏电池的重要途径。本项目拟通过Sb-Ge-Se(S)-CuI硫系玻璃薄膜的可控析晶，在薄膜内部自发构建出体相异质结网络，以改善目前逐相沉积方法制备的异质结网络中结构缺陷的问题，增强载流子分离与输运能力，有效提高光电转化效率。为解决晶化薄膜中体相异质结网络的可控构筑及其组织形貌与光伏特性关系等问题，本项目拟通过综合表征不同成分薄膜的析晶动态过程，阐明各晶化工艺条件下特定组织形貌形成的内在原因，从而掌握体相异质结网络的构筑规律。同时，设计合理的器件结构，将晶化获得的异质结网络应用于光伏电池；结合能带结构、载流子输运特性的研究与器件关键指标的表征，阐明异质结网络组织形貌与光伏特性关系。本项目研究有望提供一种通过玻璃薄膜的晶化处理构筑体相异质结网络的新思路，并为该手段在其他材料体系中的推广提供理论基础。

中文关键词： 硫系玻璃；薄膜太阳电池；晶化；异质结；纳米结构

英文摘要： The construction of bulk heterojunction networks in the solar cells provides an important way to develop low cost and high efficiency solar cells. In this proposal, bulk heterojunction networks are supposed to be spontaneously constructed in Sb-Ge-Se(S)-CuI chalcogenide glassy thin films by controllable crystallization. This technique is expected to reduce the structural defects which typically exist in the heterojunction networks fabricated by phase-by-phase deposition, consequently increasing the separation and transport ability of charge carriers and improving the photoelectric conversion efficiency. Aiming at the controllable fabrication of bulk heterojunction networks in crystallized films, and for clarifying the relationship between their structure and photovoltaic properties, a comprehensive characterization of the dynamic crystallization process will be carried out in the thin films with different compositions, so that the underlying causes of the formation of a particular morphology under certain process condition can be clarified, and the rule for building heterojunction networks by crystallization can be mastered. Meanwhile, solar cells based on the crystallization-formed heterojunction networks will be designed and fabricated. Sequentially, by combining the studies on the energy band structure, the carrier transport characteristics and the device performance, the relationship between the morphology and the photovoltaic properties of the heterojunction network can be clarified. This study is promising to provide a new way to construct bulk heterojunction networks through crystallization of glassy thin films, and also provides a theoretical basis for the generalization of this synthesis technique in other material systems.

英文关键词： Chalcogenide glass;Thin film solar cell;Crystallization;Heterojunction;Nanostructured