1,721,985 research outputs found
Perovskite solar cells go lead free
No full textMain Text (Joule 1, 659–664; December 20, 2017) In the originally published version of this article, the author wrote that CdTe solar cells benefit from an exception of the “Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment” (RoHS). In reality, any solar cell technologies benefit from an exemption of the RoHS. Thus, a potential perovskite solar cells technology is currently allowed in the European energy market. The text has been amended accordingly online and in print. The author apologizes for any confusion this error may have caused
Stable Tin-Based Perovskite Solar Cells
Full text linkAbate A. Stable Tin-Based Perovskite Solar Cells. ACS Energy Letters. 2023;8(4):1896-1899.The developments in halide perovskite research target the next era of semiconductors. Photovoltaic solar cells are only one of the technologies that could be exploiting the potential of perovskites soon. Stability and toxicity are two critical aspects of photovoltaic applications because of the long-lasting lifetime and large volumes of the targeted technologies, such as multijunction solar cells with high power conversion efficiency. In this Perspective piece, I discuss how stability and toxicity can be addressed now, incentivizing the research toward lead-free and low-lead formulations. Recent works demonstrated that tin is a possible way out of the toxicity and stability issues of current perovskite formulations. I give speculative directions for stable tin-based perovskite solar cells
Impianti elettrici nei luoghi con pericolo di esplosione: comportamento dei gas nella formazione di atmosfere esplodibili
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Stability of Organic Cations in Solution-Processed CH3NH3PbI3 Perovskites: Formation of Modified Surface Layers
Full text linkCalloni A, Abate A, Bussetti G, et al. Stability of Organic Cations in Solution-Processed CH NH PbI Perovskites: Formation of Modified Surface Layers. The Journal of Physical Chemistry C. 2015;119(37):21329-21335.We report on a combined X-ray and UV photoemission spectroscopy study (XPS and UPS) of organic–inorganic perovskites prepared from a solution of lead chloride (PbCl2) and methylammonium iodide (CH3NH3I). The XPS intensities are consistent with a pure iodide perovskite (CH3NH3PbI3), with no detectable chloride left. However, we found that the elimination of chloride results in residual methylamine molecules (CH3NH2) trapped within the perovskite crystal lattice. Furthermore, we show that vacuum annealing or sputtering induces the formation of a thin PbI2 layer at the crystal surface which acts as a surface barrier blocking electron transfer from the underlying perovskite film
Segesta. Agora. Settore Est (2012), in Notizie degli scavi di antichità comunicate dalla Scuola Normale Superiore di Pisa. Rassegna Archeologica del Laboratorio di Storia, Archeologia e Topografia del mondo antico
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