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October 2021
- Do you have data or code associated with published articles and/or completed grants and research projects? Visit the UA Research Data Repository (ReDATA) to learn how UA affiliates can use ReDATA to comply with funder mandates as well as UA data retention policies. Just like the UA Campus Repository, ReDATA is designed for materials intended for public availability.
- Applications are being accepted for the UAL Data Grant Program until December 1, 2021. UA faculty members, graduate students, post-doctoral research associates and staff are eligible to apply.
September 2021
- The Ludwig W. Adamec and M. Mobin Shorish collections are now publicly available in the UA Campus Repository. The University of Arizona Libraries also provides public access to the Kabul Times (1962-1980) and Anis (1946-1984) newspapers. These historical collections include unique collection of documents related to Afghanistan history, culture, and its development during the Jihad period and more.
August 2021
- Master's reports from Summer 2021 graduates are now available in the MS-GIST Master's Reports collection.
- Explore graduate student research in the UA Theses and Dissertations collections. More than 38,000 master's theses and dissertations are publicly available, with new titles added every month.
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Recently Added
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Spacer Engineering of Diammonium‐Based 2D Perovskites toward Efficient and Stable 2D/3D Heterostructure Perovskite Solar CellsPerovskite solar cells (PSCs) based on 2D/3D heterostructures show great potential to combine the advantages of the high efficiency of 3D perovskites and the high stability of 2D perovskites. However, an in-depth understanding of the organic-spacer effects on the 2D quantum well (QW) structures and electronic properties at the 2D/3D interfaces is yet to be fully achieved, especially in the case of 2D perovskites based on diammonium spacers/ligands. Here, a series of diammonium spacers is considered for the construct ion 2D/3D perovskite heterostructures. It is found that the chemical structure and concentration of the spacers can dramatically affect the characteristics of the 2D capping layers, including their phase purity and orientation. Density functional theory calculations indicate that the spacer modifications can induce shifts in the energy-level alignments at the 2D/3D interfaces and therefore influence the charge-transfer characteristics. The strong intermolecular interactions between the 2,2-(ethylenedioxy)bis(ethylammonium) (EDBE) cations and inorganic [PbI6]4− slabs facilitate a controlled deposition of a phase-pure QW structure (n = 1) with a horizontal orientation, which leads to better surface passivation and carrier extraction. These benefits endow the EDBE-based 2D/3D devices with a high power conversion efficiency of 22.6% and remarkable environmental stability, highlighting the promise of spacer-chemistry design for high-performance 2D/3D PSCs.
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Origins and spread of formal ceremonial complexes in the Olmec and Maya regions revealed by airborne lidarCity plans symbolizing cosmologies have long been recognized as a defining element of Mesoamerican civilizations. The origins of formal spatial configurations are thus the key to understanding early civilizations in the region. Assessment of this issue, however, has been hindered by the lack of systematic studies of site plans over broad areas. Here, we report the identification of 478 formal rectangular and square complexes, probably dating from 1,050 to 400 bc, through a lidar (laser imaging, detection and ranging) survey across the Olmec region and the western Maya lowlands. Our analysis of lidar data also revealed that the earlier Olmec centre of San Lorenzo had a central rectangular space, which possibly provided the spatial template for later sites. This format was probably formalized and spread after the decline of San Lorenzo through intensive interaction across various regions. These observations highlight the legacy of San Lorenzo and the critical role of inter-regional interaction.
