Listar por tema "defects"

Mostrando ítems 1-9 de 9

    • openAccess   Buried Interface Passivation of Perovskite Solar Cells by Atomic Layer Deposition of Al2O3 

      Ghosh, Sudeshna; Pariari, Debasmita; Behera, Tejmani; Boix, Pablo P; Ganesh, Narasimha; Basak, Susmita; Vidhan, Arya; Sarda, Nisha; Mora-Sero, Ivan; Chowdhury, Arindam; Narayan, K.S.; Sarma, D. D.; Sarkar, Shaibal American Chemical Society (2023-04-14)
      Despite having long excited carrier lifetimes and high mobilities in hybrid halide perovskite materials, conventional (n-i-p) devices exhibit significant interfacial nonradiative recombination losses that are little ...

    • openAccess   Disclosing the nature of vacancy defects in α-Ag2WO4 

      Assis, Marcelo de; Castro, M. S.; Aldao, C. M.; Buono, C.; Ortega, P. P.; Teodoro, M. D.; Andres, Juan; Gouveia, Amanda; Simões, Alexandre; Longo, Elson; Macchi, C. E.; Somoza, Alberto; Moura, F.; Ponce, Miguel Adolfo Elsevier (2023-08)
      Defects at semiconductors with electron acceptor and donor sites govern the electronic and optoelectronic applications due to their unique electronic properties. This work provides deep insight into the nature of defects and ...

    • openAccess   Formation Criteria of High Efficiency Perovskite Solar Cells in Ambient Conditions 

      Aranda Alonso, Clara; Cristobal, Cesar; Shooshtari, Leyla; Li, Cheng; Huettner, Sven; Guerrero, Antonio Royal Society of Chemistry (2017)
      The field of lead halide perovskites for solar cell applications has recently reported impressive power conversion (PCE) above 22 % using complex mixed cation formulations. Very importantly, highest PCE have been obtained ...

    • openAccess   Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials 

      Amaral, D.C.; Rosa Rocha, Leandro Silva; Granone, Luis Ignacio; Lage, M.M.; Churio, Maria Sandra; Sanchez, M. D.; Longo, Elson; Nascimento, H. M. S.; Assis, Marcelo de; Moura, F.; Ponce, M. A. American Chemical Society (2023-07-21)
      The influence of manganese modification on the spectroscopic features of manganese-doped CeO2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures ...

    • openAccess   Photonic Processing of MAPbI3 Films by Flash Annealing and Rapid Growth for High-Performance Perovskite Solar Cells 

      Serafini, Patricio; Boix, Pablo P; Barea, Eva M; Edvinson, Tomas; Sánchez, Sandy; Mora-Sero, Ivan Wiley (2022-10-06)
      Defects in polycrystalline halide perovskite films can cause a decrease of the solar cell photoconversion efficiency and stability. The perovskite film enhanced during crystal growth by controlling the processing method ...

    • openAccess   Revealing the Nature of Defects in α-Ag2WO4 by Positron Annihilation Lifetime Spectroscopy: A Joint Experimental and Theoretical Study 

      Assis, Marcelo de; Ponce, Miguel Adolfo; Gouveia, Amanda; de Souza, Daniele; Costa, João Paulo; Teodoro , Vinícius; Galvão Gobato, Yara; Andres, Juan; Macchi, Carlos; Somoza, Alberto; Longo, Elson American Chemical Society (2021)
      Electron–matter coupling is a fascinating way to tune and modify the properties of materials. In this work, we present a study on the formation and nature of vacancy-like defects in α-Ag2WO4 samples synthesized in a water ...

    • closedAccess   Structural properties and self-activated photoluminescence emissions in hydroxyapatite with distinct particle shapes 

      Machado, Thales Rafael; Sczancoski, Júlio César; Beltrán Mir, Héctor; Siu Li, Maximo; Andres, Juan; Cordoncillo, Eloisa; Leite, Edson R.; Longo, Elson Elsevier (2018-01)
      The understanding on defect-related photoluminescence (PL) properties of hydroxyapatite (HA) particles has a fundamental importance in the technological field for the development of new non-toxic biomedical and optical ...

    • closedAccess   Suppressing Nonradiative Recombination in Lead–Tin Perovskite Solar Cells through Bulk and Surface Passivation to Reduce Open Circuit Voltage Losses 

      Zhang, Kaicheng; Späth, Andreas; Almora Rodríguez, Osbel; Le Corre, Vincent; Wortmann, Jonas; Zhang, Jiyun; Xie, Zhiqiang; Barabash, Anastasia; Hammer, Maria S.; Heumüller, Thomas; Min, Jie; Fink, Rainer H.; Lüer, Larry; Li, Ning; Brabec, Christoph J. American Chemical Society (2022-10-14)
      Lead–Tin perovskite solar cells (Pb/Sn PSCs) are limited by the intrinsic instability of Sn(II), which tends to oxidize forming Sn vacancies in perovskite films. Herein, a Lewis base β-guanidinopropionic acid (GUA) and ...

    • openAccess   Utilization of Temperature-Sweeping Capacitive Techniques to Evaluate Band Gap Defect Densities in Photovoltaic Perovskites 

      Almora Rodríguez, Osbel; García-Batlle, Marisé; Garcia-Belmonte, Germà American Chemical Society (2019-06-12)
      Capacitive techniques, routinely used for solar cell parameter extraction, probe the voltage-modulation of the depletion layer capacitance isothermally as well as under varying temperature. In addition, defect states within ...