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Efficient and Stable Perovskite Solar Cells based on Nitrogen‐Doped Carbon Nanodots
Author(s) -
Collavini Silvia,
Amato Francesco,
Cabrera-Espinoza Andrea,
Arcudi Francesca,
Đorđević Luka,
Kosta Ivet,
Prato Maurizio,
Delgado Juan Luis
Publication year - 2022
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202101059
Subject(s) - materials science , perovskite (structure) , photoluminescence , carbon fibers , amorphous solid , chemical engineering , energy conversion efficiency , amorphous carbon , nanodot , doping , nanotechnology , optoelectronics , chemistry , crystallography , composite material , composite number , engineering
The role of graphitic and amorphous nitrogen‐doped carbon dots (N‐CDs) as additives for perovskite solar cells (PSCs) is investigated. A detailed study of N‐CDs: perovskite (PVSK) blends through X‐ray diffraction, nuclear magnetic resonance, field emission scanning electron microscopy, UV–vis, and photoluminescence spectroscopy reveals the existence of interactions between N‐CDs and PVSK. The amorphous or graphitic nature of these carbon nanoforms, as well as the interactions between CDs and PVSK, clearly determines the photovoltaic outcome of the PSCs. Thus, a small amount of graphitic carbon dots (g‐N‐CDs) leads to more‐stable PSCs, while maintaining and even improving the power conversion efficiency (PCE). In addition, the long‐term evaluation of the g‐N‐CDs‐containing cells shows improvement of the PCE over time, up to 109% of the initial efficiency after 40 days while the reference performance is dropped to 86%.