Bismuth Rudorffites: Promising New Materials for the Top Cell in Solution Processed Tandem PV

鲁道夫铋：用于溶液处理串联光伏顶部电池的有前途的新材料

• 批准号: 1807541
• 负责人: Hugh Hillhouse
• 金额: $ 42.49万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1807541&HistoricalAwards=false
• 关键词: Bismuth; Rudorffites; Promising; New; Materials

Non-Technical Description: An effective way to decrease the overall cost of electricity from solar energy is to increase the power conversion efficiency of solar cells, particularly if it can be accomplished with minimal increase in manufacturing cost. This goal can be achieved by adding a low-cost high-bandgap solar cell on top of a silicon solar cell. To date, the most promising materials for this top-cell are hybrid perovskites. These new materials have extraordinarily high performance, but they contain lead, which is toxic and raises environmental concerns. This project focuses on developing new low-toxicity bismuth-based high bandgap semiconductors that can potentially be used instead. The team is exploring a recently discovered class of bismuth materials called rudorffites and is building an understanding of the critical relationships between material structure, properties, and processing for these non-toxic semiconductors. This basic research could have significant societal impact by enabling the development of low-cost tandem solar cells from non-toxic elements. Furthermore, the project provides training of a graduate student, a postdoctoral scholar, and several undergraduates, as well as engage the public though the Pacific Science Center in Seattle and the Clean Energy Institute's Clean Energy Ambassadors program.Technical Description: Bismuth-based semiconductors are interesting non-toxic optoelectronic materials since the partial oxidation of Bi3+ with the 6s2 lone pair is expected to lead to similar defect tolerance as the lead-based hybrid perovskites. The recently discovered bismuth rudorffites are of particular interest since they exhibit high bandgaps suitable for tandem solar cells. Solar cells from bismuth rudorffites have a few-percentage efficiency, but they have the potential for much higher efficiency. In this project, investigators are conducting a body of fundamental research to explore the potential of solution grown bismuth rudorffites for optoelectronic applications, to understand the fundamental processes responsible for potential performance limitations and to develop strategies to overcome them. Preliminary research shows that nanoscale layer morphology and doping/alloying have a tremendous effect on the optoelectronic quality of these materials. The project utilizes combinatorial spray coating methods to synthesize a large number of alloy/doping compositions, absolute intensity photoluminescence to assess quasi-Fermi level splitting, and photoconductivity-based methods to assess the carrier diffusion length. The goal is to connect structure and processing with the most important material performance metrics for photovoltaic materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述：降低来自太阳能的电力的总成本的有效方式是增加太阳能电池的功率转换效率，特别是如果可以在制造成本增加最小的情况下实现的话。这一目标可以通过在硅太阳能电池上添加低成本的高带隙太阳能电池来实现。到目前为止，这种顶电池最有前途的材料是混合钙钛矿。这些新材料具有非常高的性能，但它们含有铅，这是有毒的，并引起了环境问题。该项目的重点是开发新的低毒性铋基高带隙半导体，可用于替代。该团队正在探索最近发现的一类称为rudorffites的铋材料，并正在建立对这些无毒半导体的材料结构，性能和加工之间的关键关系的理解。这项基础研究可能会产生重大的社会影响，使开发低成本的串联太阳能电池从无毒元素。此外，该项目还提供了一名研究生、一名博士后学者和几名本科生的培训，并通过西雅图的太平洋科学中心和清洁能源研究所的清洁能源大使计划吸引公众参与。由于Bi ~（3+）的部分氧化，铋基半导体材料是一种非常有意义的无毒光电材料期望6S 2孤对导致与铅基混合钙钛矿类似的缺陷容限。最近发现的铋rudorffite是特别感兴趣的，因为它们表现出高的带隙适合于串联太阳能电池。铋的太阳能电池有几个百分比的效率，但它们有潜力获得更高的效率。在该项目中，研究人员正在进行一系列基础研究，以探索溶液生长的铋鲁道夫石在光电子应用中的潜力，了解导致潜在性能限制的基本过程，并制定克服这些限制的策略。初步研究表明，纳米层形态和掺杂/合金化对这些材料的光电质量有巨大的影响。该项目利用组合喷涂方法来合成大量的合金/掺杂组合物，绝对强度光致发光来评估准费米能级分裂，以及基于光电导的方法来评估载流子扩散长度。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

On interface recombination, series resistance, and absorber diffusion length in BiI 3 solar cells

BiI 3 太阳能电池中的界面复合、串联电阻和吸收体扩散长度

• DOI: 10.1063/5.0034776
• 发表时间: 2021
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: Meng, Yuhuan;Magruder, Benjamin R.;Hillhouse, Hugh W.
• 通讯作者: Hillhouse, Hugh W.