项目名称: 量子点敏化太阳能电池的超快太赫兹光谱研究
项目编号: No.61205100
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 信息四处
项目作者: 朱礼国
作者单位: 中国工程物理研究院流体物理研究所
项目金额: 25万元
中文摘要: 本项目拟针对量子点敏化太阳能电池中光吸收效率高但光电转化效率低的问题,利用超快太赫兹光谱对其进行电荷转移机理的研究。该太阳能电池的核心是由半导体量子点与金属氧化物纳米线阵列合成的复合结构。光生电荷在这种结构中的产生、转移以及输运过程是光电转换的关键,同时也是国内外研究的热点和难点。本项目拟利用具有亚皮秒时间分辨率的太赫兹光谱围绕该结构的电荷转移开展:1)载流子产生瞬间的输运性质的研究、2)不同材料、大小的量子点和不同吸附间距的结构制备的电池中光生载流子从量子点转移到纳米线阵列的机理的研究、3)结合Marcus理论进行系统的实验和理论分析,4)自由电子在金属氧化物纳米线阵列中的输运和动力学过程。通过以上研究,项目预期:1)实现将超快太赫兹光谱系统地引入到对量子点敏化太阳能电池的研究,2)获取该太阳能电池中光电转换的机理和限制因素,3)为制备具有高光电转化效率的量子点敏化太阳能提供科学依据。
中文关键词: 超快太赫兹光谱;太阳能电池;电荷转移;量子点敏化硅纳米材料;电荷倍增
英文摘要: In this proposal, ultrafast time-resolved Terahertz (THz) spectroscopy'll be adopted to study the machenism of charge transfer in quantum dots (QDs) sensitized solar cells (QDSSCs),within which high optical absorption only yields very low sunlight-to-electricity conversion efficency. Semiconductor QDs/metal oxide nanowire arrays (MONWAs) junction is the key structure of the QDSSCs that we propose to fabricate and study by THz spectroscopy. High optical absorption in this kind of QDSSCs has been demonstrated both theoretically and experimentally, but very low sunlight-to-electricity conversion efficiency in this solar cell has been found by experiments. Charge carrier generation, transfer and tranport in QDSSCs are key processes for sunlight-to-electricity conversion, which are hot topics and also difficulties in both oversea and domestic solar cell reseach communities. We propose to carry out the following researches on QDSSCs using ultrafast time-resloved THz spectroscopy: 1)transient charge transport properties during charge carrier generation, 2) charge transfer mechanism from QDs to MONWAs in QDSSCs made with different materials, with differient-size QDs, and with different space between QD and MONWA, 3) theoretical analysis the above experimental results with Marcus theory, 4) free charge carrier transport
英文关键词: Ultrafast Terahertz Spectroscopy;Solar Cell;Charge transfer;QDs-Si nanomaterials;Charge manipulation