EAGER:TDM Solar Cells: Research on CdSe-Si tandem junction cells

EAGER:TDM太阳能电池：CdSe-Si串联结电池的研究

• 批准号: 1664945
• 负责人: Vikram Dalal
• 金额: $ 29.99万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-15 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1664945&HistoricalAwards=false
• 关键词: EAGER; TDM; Solar; Cells; Research

Abstract:Non-technical description of the projectThe conversion of solar energy into electricity using photovoltaic (PV) technology is an important technology with significant potential for reducing global warming. Currently, the costs of the PV solar energy system are dominated by systems related costs, such as structural costs, field wiring and the costs of chemical encapsulant materials and glass. In order to significantly reduce the total costs of solar PV technology, the conversion efficiency needs to be increased from the current ~15-20% to 30%, because most of the systems costs reduce proportionately with an increase inefficiency. The only way to achieve such higher efficiencies is to use a tandem junction solar cell, comprising two materials, one with a high bandgap and one with a lower bandgap. In this project, we will investigate the fundamental properties of an inorganic material, CdSe, then make solar cells in this material, and then make proof-of-concept tandem junction solar cells by combining cells made in this material with cells made in Si. The project will involve the research training of graduate and undergraduate students, including women scientists. The advantage to society is a significant lowering of the cost of solar energy conversion technology, thereby accelerating the deployment of solar energy into the nation's grid. The project is a joint project between Iowa State University and Syracuse University.Technical description of the project:CdSe is an interesting new material with a bandgap (~1.72 eV) which is in the range needed to make tandem cells with Si. But not much is known about the electronic properties of this material, nor have any high efficiency cells been made in this material. A fundamental objective of this project is to study electronic properties of thin films of this material and then make proof-of-concept solar cells in the material. Among the properties to be studied will be doping concentration, mobility of electrons and holes, deep defect densities and recombination phenomena, minority carrier diffusion lengths, electron affinities and energies of band edges. Structural, electronic and optical measurement techniques will be used to measure the relevant properties. CdSe films will be deposited using multi-source evaporation techniques.In addition to studying these fundamental electronic properties, we will make proof-of-concept devices using appropriate heterojunctions. In addition, we will make proof-of-concept tandem cells using tunnel junctions between CdSe and Si. The objective is to demonstrate that one can indeed make tandem junction cells using this new material system. Appropriate heavily doped contact layers will be used on both CdSe and c-Si cells to make efficient tunnel junctions to connect the two cells. The goal is to obtain an open-circuit voltage of ~1.5V in a tandem cell, and also a high fill factor, thereby demonstrating that the tandem junction concept works. The intellectual merit of the project lies in systematically investigating the potential of a stable, inorganic material system for making high efficiency solar cells.

摘要：项目非技术说明利用光伏（PV）技术将太阳能转化为电能是一项重要技术，在减少全球变暖方面具有巨大潜力。目前，光伏太阳能系统的成本主要是系统相关成本，例如结构成本、现场布线以及化学封装材料和玻璃的成本。为了显着降低太阳能光伏技术的总成本，需要将转换效率从目前的~15-20%提高到30%，因为大多数系统成本随着低效率的增加而成比例地降低。实现如此高效率的唯一方法是使用串联结太阳能电池，该电池由两种材料组成，一种具有高带隙，另一种具有较低带隙。在这个项目中，我们将研究无机材料 CdSe 的基本特性，然后用这种材料制造太阳能电池，然后通过将该材料制造的电池与硅制造的电池结合起来制造概念验证串联结太阳能电池。该项目将涉及研究生和本科生（包括女科学家）的研究培训。对社会的好处是显着降低太阳能转换技术的成本，从而加速太阳能进入国家电网的部署。该项目是爱荷华州立大学和雪城大学的联合项目。项目技术描述：CdSe 是一种有趣的新材料，其带隙（~1.72 eV）处于与 Si 制造串联电池所需的范围内。但人们对这种材料的电子特性知之甚少，也没有用这种材料制造任何高效电池。该项目的基本目标是研究这种材料薄膜的电子特性，然后用该材料制作太阳能电池的概念验证。要研究的特性包括掺杂浓度、电子和空穴的迁移率、深缺陷密度和复合现象、少数载流子扩散长度、电子亲和力和带边能量。将使用结构、电子和光学测量技术来测量相关特性。 CdSe 薄膜将使用多源蒸发技术沉积。除了研究这些基本电子特性之外，我们还将使用适当的异质结制造概念验证器件。此外，我们将利用 CdSe 和 Si 之间的隧道结制造概念验证串联电池。目的是证明人们确实可以使用这种新材料系统制造串联连接电池。 CdSe 和 c-Si 电池上将使用适当的重掺杂接触层，以形成有效的隧道结来连接这两种电池。目标是在串联电池中获得约 1.5V 的开路电压以及高填充因子，从而证明串联结概念的有效性。该项目的智力价值在于系统地研究稳定的无机材料系统用于制造高效太阳能电池的潜力。

项目成果

Efficient Heterojunction Thin Film CdSe Solar Cells Deposited Using Thermal Evaporation

采用热蒸发沉积的高效异质结薄膜 CdSe 太阳能电池

• 发表时间: 2019
• 期刊: Conference record of the IEEE Photovoltaic Specialists Conference
• 作者: Bagheri, Behrang;Kottokkaran, Ranjith;Poly, Laila;Sharikadze, Saba;Reichert, Benjamin;Noack, Max;Dalal, Vikram
• 通讯作者: Dalal, Vikram

Influence of post-deposition selenization and cadmium chloride assisted grain enhancement on electronic properties of cadmium selenide thin films

沉积后硒化和氯化镉辅助晶粒增强对硒化镉薄膜电子性能的影响

• DOI: 10.1063/1.5124881
• 发表时间: 2019
• 期刊: AIP Advances
• 影响因子: 1.6
• 作者: Bagheri, Behrang;Kottokkaran, Ranjith;Poly, Laila-Parvin;Reichert, Ben;Sharikadze, Saba;Noack, Max;Dalal, Vikram
• 通讯作者: Dalal, Vikram