EAPSI:Investigating the Ultrafast Charge Dynamics in Polymer Solar Cells Incorporating Nanostructured Silver Electrodes

EAPSI：研究采用纳米结构银电极的聚合物太阳能电池的超快充电动力学

• 批准号: 1515423
• 负责人: Christopher Petoukhoff
• 金额: $ 0.53万
• 依托单位: Petoukhoff Christopher E
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1515423&HistoricalAwards=false
• 关键词: EAPSI; Investigating; Ultrafast; Charge; Dynamics

In the search for sustainable energy sources, low energy consumption technologies are critical to minimize our environmental impact and maximize the energy harvested. Polymer solar cells are lightweight, flexible alternatives to traditional solar cells and have potential energy payback times as low as one day (compared to 2.5 years required for solar cells made from silicon), if their efficiency can reach 15%. One way to improve the efficiency of polymer solar cells is to employ light-trapping techniques, such as using nanostructured metallic electrodes. While polymer solar cells incorporating metallic nanostructures are known to have improved light absorption in the polymer active layer, this does not always translate to improved electrical output. This study seeks to fundamentally understand why improved light absorption does not necessarily lead to improved electrical output in the presence of nanostructured metallic electrodes. To do this, ultrafast time-resolved photoinduced absorption measurements will be conducted at Okinawa Institute of Science and Technology in collaboration with Professor Keshav Dani, who is an expert in conducting ultrafast time-resolved measurements.Nanostructured Ag electrodes will be fabricated with the structure of Ag nanoparticle arrays on a Ag thin film (AgNPA/Ag). To mitigate the effects of charge recombination at the AgNPA surface, a series of ultrathin interfacial layers (exfoliated MoS2, Ag2O, and graphene oxide) will be applied to the AgNPA/Ag and compared to AgNPA/Ag without an interfacial layer. The prototypical polymer:fullerene blend, P3HT:PCBM, in which the photophysics are well-established, will be used as the active layer coating. Two-color pump-probe measurements will be employed, in which P3HT:PCBM will be optically pumped with a wavelength within its absorption band, and the probe wavelengths selected will be those corresponding to photoinduced absorption from P3HT excitons (bound electron-hole pairs) and P3HT:PCBM polarons (free electrons and holes) over a time scale of tens of fs to 1 ns. This will allow the elucidation of whether the initially improved population of excitons in the P3HT:PCBM layer translates to an improved polaron population, with the expectation that both exciton and polaron photoinduced absorption should both be greater in the presence of the passivated AgNPA/Ag, which would eventually translate to improved solar cell device efficiency. This NSF EAPSI award is funded in collaboration with the Japan Society for the Promotion of Science.

在寻找可持续能源的过程中，低能消耗技术对于最大程度地减少我们的环境影响并最大程度地收获了收获的能源至关重要。聚合物太阳能电池是传统太阳能电池的轻巧，灵活的替代品，并且具有一天低至一天的势能回报时间（相比之下，由硅制造的太阳能电池所需的2.5岁），如果它们的效率达到15％。提高聚合物太阳能电池效率的一种方法是采用轻型捕获技术，例如使用纳米结构的金属电极。虽然已知聚合物纳米结构的聚合物太阳能电池在聚合物活性层中具有改善的光吸收，但这并不总是转化为改进的电输出。这项研究旨在从根本上理解为什么在纳米结构金属电极存在下，改善的光吸收不一定会改善电输出。为此，将在冲绳科学技术研究所与Keshav Dani教授合作进行超快的光诱导的吸收测量值，后者将与Ag nanoparticle Ag ag ag agnpa（agnpa agnpa agnpa and ag agnpa and ag agnpa制造）进行超级时间的时间分解测量。为了减轻AGNPA表面电荷重组的影响，将应用一系列超薄界面层（去角质MOS2，AG2O和氧化石墨烯），将其应用于AGNPA/Ag，并与没有界面层的AGNPA/AG进行比较。原型聚合物：富勒烯混合物，P3HT：PCBM，其中摄影学是良好的，将用作活性层涂层。 Two-color pump-probe measurements will be employed, in which P3HT:PCBM will be optically pumped with a wavelength within its absorption band, and the probe wavelengths selected will be those corresponding to photoinduced absorption from P3HT excitons (bound electron-hole pairs) and P3HT:PCBM polarons (free electrons and holes) over a time scale of tens of fs to 1 ns.这将允许阐明P3HT：PCBM层中最初改善的激子群体是否转化为改善的极性人群，并期望在钝化的AGNPA/AG的情况下，激子和极性光诱导的吸收均应更大，这最终将改善了Solar Cell Device设备的提高。该NSF EAPSI奖与日本促进科学学会合作。