【环境讲坛55期】Luminescent Solar Concentrators Based on Engineered Quantum Dots
来源： 发布时间：2017-09-28 点击次数：
报告人：Victor I. Klimov 教授
Luminescent solar concentrators (LSCs) can serve as large-area sunlight collectors for terrestrial and space-based photovoltaics (PVs). Due to their high emission efficiencies and readily tuneable emission and absorption spectra, colloidal quantum dots (QDs) have emerged as promising LSC fluorophores, superseding dye molecules previously dominating the LSC field. An important advantage of the QDs over dye-based systems is a possibility to greatly reduce losses to re-absorption by displacing the emission band from the onset of strong optical absorption, the approach commonly referred to as "Stokes-shift engineering." Spectral tunability of the QDs also facilitates the realization of stacked multi-layered LSCs wherein the enhanced performance is obtained through spectral splitting of incident sunlight, as in multi-junction PVs. This presentation will discuss several approaches to Stokes-shift engineering with II-VI and I-III-VI2 QDs and also describe the first example of a large-area (>200 cm2) tandem LSC based on two types of nearly reabsorption-free QDs spectrally-tuned for optimal solar-spectrum splitting. This prototype device exhibits a record-high optical quantum efficiency of more than 6% for sunlight illumination and solar-to-electrical power conversion efficiency of >3%. Due to their strong performance achievable with low-cost, solution-processible materials, QD-based LSC tandems can provide a viable pathway for greatly reducing the cost of solar electricity by complementing the existing PV technology with inexpensive, high-efficiency sunlight collectors deployable either as strongly absorbing LSC-PV modules or semi-transparent building-integrated solar windows.
Victor I. Klimov，美国能源部国家能源前沿研究中心——先进太阳能光物理中心主任，洛斯阿拉莫斯国家实验室高级研究员。1993年于俄罗斯莫斯科国立大学取得博士学位。主要从事半导体纳米晶体中多重激子效应、俄歇复合、光电转化以及发光太阳能聚光器的研究。2003年，当选为美国物理学会会士(fellow)，同年入选美国光学会的会士(fellow)，2004年当选为洛斯阿拉莫斯国家实验室fellow。迄今为止，撰写专著3本，参与撰写7本，以第一作者和通讯作者发表论文224篇，其中Nature主刊和子刊发表共20篇，Sicence 2篇，JACS18篇，Phys. Rev. Lett.19篇，Nano Letter 33篇，ACS Nano 15篇，Chemical Review 1篇， h因子高达89，总引用次数31677次。