Efficient Inverted Solar Cells Using Benzotriazole-Based Small Molecule and Polymers

We synthesized medium-band-gap donor-acceptor (D-A) -type conjugated polymers (PBTZCZ-L and PBTZCZ-H) consisting of a benzotriazole building block as an acceptor and a carbazole unit as a donor. In comparison with the polymers, a small conjugated molecule (BTZCZ-2) was developed, and its structural,...

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Detalles Bibliográficos
Autores principales: Lee, Ja Eun, Kim, Yoon, Na, Yang Ho, Baek, Nam Seob, Jung, Jae Woong, Choi, Yura, Cho, Namchul, Kim, Tae-Dong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7866035/
https://www.ncbi.nlm.nih.gov/pubmed/33513679
http://dx.doi.org/10.3390/polym13030393
Descripción
Sumario:We synthesized medium-band-gap donor-acceptor (D-A) -type conjugated polymers (PBTZCZ-L and PBTZCZ-H) consisting of a benzotriazole building block as an acceptor and a carbazole unit as a donor. In comparison with the polymers, a small conjugated molecule (BTZCZ-2) was developed, and its structural, thermal, optical, and photovoltaic properties were investigated. The power conversion efficiency (PCE) of the BTZCZ-2-based solar cell devices was less than 0.5%, considerably lower than those of polymer-based devices with conventional device structures. However, inverted solar cell devices configured with glass/ITO/ZnO:PEIE/BTZCZ-2:PC(71)BM/MoO(3)/Ag showed a tremendously improved efficiency (PCE: 5.05%, J(sc): 9.95 mA/cm(2), V(oc): 0.89 V, and FF: 57.0%). We believe that this is attributed to high energy transfer and excellent film morphologies.

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