DataVXACS Energy LettersPaper
journal article·2018-08-10

Light-Induced Formation of Pb3+ Paramagnetic Species in Lead Halide Perovskites

Silvia Colella, Michela Todaro, Sofia Masi, Andrea Listorti, Davide Altamura, Rocco Caliandro, Cinzia Giannini, Elisa Carignani, Marco Geppi, Daniele Meggiolaro, Gianpiero Buscarino, Filippo De Angelis, Aurora Rizzo

ACS Energy Letters· Volume 3· Issue 8
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Source abstract

Abstract

Hybrid halide perovskites are soft materials processed at room temperature, revolutionary players in the photovoltaic field. Nowadays, investigation of the nature and role of defects is seen as one of the key challenges toward full comprehension of their behavior and achievement of high device stability under working conditions. We reveal the reversible generation, under illumination, of paramagnetic Pb3+ defects in CH3NH3PbI3, synthesized in ambient conditions, induced by the presence of Pb–O defects in the perovskite structure that may trap photogenerated holes, possibly mediated by the concomitant oxidation and migration of ions. According to the mechanism that we hypothesize, one charge is trapped for each paramagnetic center generated; thus, it does not contribute to the photocurrent, potentially limiting the solar cell performance. Our study, based on combined experimental/theoretical approach, reveals the dynamic evolution of the perovskite characteristics under illumination that needs to be considered when investigating the material physical–chemical properties.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CNR NANOTEC − Institute of Nanotechnology, Polo di Nanotecnologia, c/o Campus Ecotekne, Via Monteroni, 73100 Lecce, Italy

Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento, Campus Ecotekne, Via Arnesano, 73100 Lecce, Italy

Dipartimento di Fisica e Chimica, Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy

IC CNR − Istituto di Cristallografia, Via Amendola 122/O, 70126 Bari, Italy

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi, 13, 56124 Pisa, Italy

Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, 06123 Perugia, Italy

D3-CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy

Funding

Ministero dell?Istruzione, dell?Universit? e della Ricerca · Universit? di Pisa · Regione Puglia · Agenzia Regionale per la Tecnologia e l'Innovazione

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