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

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.

• 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