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Unraveling Interfacial Photoinduced Charge Transfer and Localization in CsPbBr3 Nanocrystals/Naphthalenediimide

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Autor(es):
Morais, Eliane A. ; Lemes, Maykon A. ; Souza, Natalilian R. S. ; Ito, Amando Siuiti ; Duarte, Evandro L. ; Silva, Ronaldo S. ; Brochsztain, Sergio ; Souza, Jose A.
Número total de Autores: 8
Tipo de documento: Artigo Científico
Fonte: ACS OMEGA; v. 9, n. 20, p. 9-pg., 2024-05-09.
Resumo

Halide perovskites have attracted much attention for energy conversion. However, efficient charge carrier generation, separation, and mobility remain the most important issues limiting the higher efficiency of solar cells. An efficient interfacial charge transfer process associated with exciton dynamics between all-inorganic CsPbBr3 nanocrystals and organic electron acceptors has been suggested. We observed a strong PL quenching of 78% in thin films when silane-functionalized naphthalenediimides (SNDI), used as electron-acceptors, are anchored on CsPbBr3 nanocrystals. Optical and structural characterizations confirm the charge transfer process without QDs degradation. The issue of whether these transferred charges are indeed available for utilization in solar cells remains uncertain. Our results reveal that the CsPbBr3 nanocrystals capped with these electron-acceptor SNDI molecules show a drastic increase in the electrical resistance and the absence of a photoconductivity effect. The results suggest charge transfer followed by strong localization of the charge carriers, preventing their extraction toward the electrodes of solar cell devices. We hope that this crucial aspect to attract attention and unveil a potential mechanism for charge delocalization, which could, in turn, lead to a groundbreaking enhancement in solar cell efficiency. (AU)

Processo FAPESP: 23/01316-3 - Magnetismo em perovskitas 2D de haletos com acoplamento magnetoelétrico e aplicação em spintrônica
Beneficiário:José Antonio Souza
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 23/10982-7 - Magnetismo em perovskitas 2D de haletos com acoplamento magnetoelétrico e aplicação em spintrônica
Beneficiário:Maykon Alves Lemes
Modalidade de apoio: Bolsas no Brasil - Programa Fixação de Jovens Doutores
Processo FAPESP: 21/14422-0 - Design computacional de perovskitas de haletos estáveis: efeitos de defeitos, ligas, e pressão
Beneficiário:Gustavo Martini Dalpian
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 17/02317-2 - Interfaces em materiais: propriedades eletrônicas, magnéticas, estruturais e de transporte
Beneficiário:Adalberto Fazzio
Modalidade de apoio: Auxílio à Pesquisa - Temático