Displayed over roof tops and in solar farms, silicon-based solar cells are, so far, one of the most efficient systems in generating electricity from sunlight, but their fabrication can be expensive and energy demanding, aside from being heavy and bulky. The alternative solution of lower-cost thin film solar cells also brings the caveat of being mainly composed of toxic elements such as lead or cadmium, or containing scarce elements such as indium or tellurium.
In the search for new technologies for thin photovoltaic systems, solar cells based onAgBiS2GydF4y2Bananocrystalshave emerged as a star player in the game, consisting of non-toxic, earth-abundant elements, produced in ambient conditions at low temperatures and with low-cost solution-processing techniques. It can be integrated in ultrathin solar cells and has proven to be very stable, avoiding degradation of the cell over long periods of time.
早在2016年，ICREA教授在ICFO Gerasimos Konstantatos进行的研究制造了一个基于AGBIS2纳米晶体的半导体吸收器35nm厚的太阳能电池，该纳米晶体在非常低的温度（100ºC）（100ºC）（级数低）（级数低）基于太阳能电池）并通过逐层沉积过程在纳米级设计，以达到约6％的效率。尽管是硅的有希望的绿色替代品，但这些细胞仍然无法实现与商业化相关的引人入胜的性能。GydF4y2Ba
As such, many studies delved into ways to improve their performance and found that the optimal thickness of these semiconductor absorbers is closely linked to the absorption coefficients, thus the goal would be to find an ultrathin solar cell capable of having a high absorption efficiency, quantum efficiency and ultimate performance while reducing cost, weight and manufacturing. But, while aiming for an ultra-thin layered cell, the issue of dealing with light-trapping structures would add cost and complexity to the issue, because the thinner the structure, the more complex it becomes to absorb energy.
To overcome this challenge, ICFO researchersYongjie WanGydF4y2BaGGydF4y2Ba，，，，GydF4y2BaIgnasi Burgues-Ceballos， 与合作GydF4y2Ba大卫·斯坎伦教授GydF4y2Ba来自伦敦大学学院GydF4y2BaProf阿隆·沃尔什（Aron Walsh）GydF4y2Ba来自伦敦帝国学院和GydF4y2BaSeánKavanaghGydF4y2Ba（UCL和帝国），由ICFO的ICREA教授领导GydF4y2BaGerasimos Konstantatos，取得了相当大的飞跃，并取得了突破性的结果。他们的研究在自然光子学上发表，报告了一种基于Agbis制造这些太阳能电池的全新方法GydF4y2Ba2GydF4y2Ba这使吸收系数高于迄今为止使用的任何其他光伏材料。GydF4y2Ba
阳离子障碍GydF4y2Ba
In their study, the researchers cleverly engineered the layer of nanocrystals in the cell with an unconventional approach called cation disorder engineering. To do this, they took the AgBiS2GydF4y2Bananocrystals and by using a mild annealing process, they were able to tune the atomic positions of the cations within the lattice to actually force acation inter-site exchange并实现GydF4y2Ba同质阳离子分布GydF4y2Ba。GydF4y2Ba
通过应用不同的退火温度并在结晶排列中实现不同的阳离子分布，他们能够证明这种半导体材料表现出吸收系数GydF4y2Ba大5-10倍GydF4y2Bathan any other material currently used in photovoltaic technology and, even more so, across a spectral range that cover from the紫外线GydF4y2Ba（（400nm) to the红外线的GydF4y2Ba（1000nm）。为此，这种新材料需要一种新的表面化学，以便在退火时保留纳米晶体的光电质量。因此，作者利用膀胱丙酸作为一种钝化配体，在退火时保留了材料质量。GydF4y2Ba
半导体电子书GydF4y2Ba
去年的顶级访谈，文章和新闻的汇编。欧洲杯猜球平台GydF4y2Ba
