STTR Phase I: P-Type CdSe for Thin-Film Top Cells Enabling High-Efficiency Monolithic Tandem Photovoltaics

STTR 第一阶段：用于薄膜顶部电池的 P 型 CdSe，实现高效单片串联光伏发电

• 批准号: 0320375
• 负责人: Lawrence Woods
• 金额: $ 9.99万
• 依托单位: ITN ENERGY SYSTEMS, INC.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0320375&HistoricalAwards=false
• 关键词: STTR; Phase; Type; CdSe; Thin

This Small Business Technology Transfer (STTR) Phase I project will develop a wide-bandgap, thin-film semiconductor to enable a high-efficiency light-absorber layer for the top cell in monolithic tandem or multi-junction thin-film photovoltaics. Because of relatively high device packaging costs, tandem junction thin-film photovoltaic devices can offer higher watt per square meter and lower cost per watt than their single junction counterparts. In order to overcome the current low thin-film device efficiencies for materials with bandgaps greater than 1.6 eV, it is proposed to use CdSe, with a bandgap of 1.72 eV, which is an optimum bandgap for a top cell of a tandem junction device when sharing the solar spectrum with an existing high-efficiency thin-film bottom cell. However CdSe likes to be an n-type semiconductor, which does not allow for its use as a top cell with the correct polarity on the high-efficiency p-type bottom cell for monolithically integrated (two-terminal) tandem devices. In this project an innovative approach to overcome this problem is proposed which involves using existing low-cost deposition techniques with added doping capability to fabricate p-type thin-films of CdSe. The retention of this conductivity type after high-temperature device processing will also be confirmed so as to enable high-efficiency devices as needed for application in the monolithic tandem device. Commercially, two of the most important near-term markets for high-efficiency flexible lightweight tandem-junction photovoltaics are space and high-altitude airships (HAA). In addition it is possible to leverage the monolithic tandem PV space/HAA product technology for the implementation of a low-cost monolithic tandem PV terrestrial product. The terrestrial product is anticipated to have a significant impact toward reducing the cost of alternative energy (solar electric).

这个小型企业技术转移（STTR）I期项目将开发一个宽带胶质，薄膜半导体，以在整体串联或多开结式薄膜光伏电动机中为顶部细胞提供高效的轻度吸收层。 由于设备包装成本相对较高，串联连接薄膜光伏设备比单点交界处的设备可以提供更高的瓦特仪，每平方米的成本更高，每瓦的成本更低。 为了克服当前的低薄膜设备效率的带镜材料大于1.6 eV的材料，建议使用CDSE，带隙为1.72 eV，这是与现有的高效率高效率薄纤维底部单元共享串联连接设备的顶部电池的最佳带隙。 但是，CDSE喜欢是N型半导体，它不允许将其用作具有正确极性的顶部细胞，用于单层整合（两端）串联设备的高效P型底部细胞。 在该项目中，提出了一种创新的方法来克服此问题，该方法涉及使用现有的低成本沉积技术，并增加了掺杂能力来制造CDSE的P型薄膜。高温装置处理后这种电导率类型的保留也将得到确认，以便根据需要在整体串联设备中应用的高效设备。 在商业上，高效柔性轻巧的串联光伏的两个最重要的近期市场是空间和高空飞艇（HAA）。 此外，有可能利用单片串联PV空间/HAA产品技术来实施低成本的单片串联PV陆地产品。预计陆生产品将对降低替代能源的成本（太阳能电气）产生重大影响。