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Title: Versatile aza-BODIPY-based low-bandgap conjugated small molecule for light harvesting and near-infrared photodetection
Authors: Bhat, Gurudutt
Kielar, Marcin
Rao, Haixia
Gholami, Mahnaz D.
Mathers, Isabel
Larin, Astrid C. R.
Flanagan, Thomas
Erdenebileg, Enkhtur
Bruno, Annalisa
Pannu, Amandeep Singh
Fairfull-Smith, Kathryn E.
Izake, Emad L.
Sah, Pankaj
Lam, Yeng Ming
Pandey, Ajay K.
Sonar, Prashant
Keywords: Engineering::Materials
Issue Date: 2022
Source: Bhat, G., Kielar, M., Rao, H., Gholami, M. D., Mathers, I., Larin, A. C. R., Flanagan, T., Erdenebileg, E., Bruno, A., Pannu, A. S., Fairfull-Smith, K. E., Izake, E. L., Sah, P., Lam, Y. M., Pandey, A. K. & Sonar, P. (2022). Versatile aza-BODIPY-based low-bandgap conjugated small molecule for light harvesting and near-infrared photodetection. InfoMat, 4(12).
Project: MOE2019-T2-1-085 
S18-1176- SCRP 
Journal: InfoMat 
Abstract: The versatile nature of organic conjugated materials renders their flawless integration into a diverse family of optoelectronic devices with light-harvesting, photodetection, or light-emitting capabilities. Classes of materials that offer the possibilities of two or more distinct optoelectronic functions are particularly attractive as they enable smart applications while providing the benefits of the ease of fabrication using low-cost processes. Here, we develop a novel, multi-purpose conjugated small molecule by combining boron-azadipyrromethene (aza-BODIPY) as electron acceptor with triphenylamine (TPA) as end-capping donor units. The implemented donor–acceptor–donor (D–A–D) configuration, in the form of TPA-azaBODIPY-TPA, preserves ideal charge transfer characteristics with appropriate excitation energy levels, with the additional ability to be used as either a charge transporting interlayer or light-sensing semiconducting layer in optoelectronic devices. To demonstrate its versatility, we first show that TPA-azaBODIPY-TPA can act as an excellent hole transport layer in methylammonium lead triiodide (MAPbI3)-based perovskite solar cells with measured power conversion efficiencies exceeding 17%, outperforming control solar cells with PEDOT:PSS by nearly 60%. Furthermore, the optical bandgap of 1.49 eV is shown to provide significant photodetection in the wavelength range of up to 800 nm where TPA-azaBODIPY-TPA functions as donor in near-infrared organic photodetectors (OPDs) composed of fullerene derivatives. Overall, the established versatility of TPA-azaBODIPY-TPA, combined with its robust thermal stability as well as excellent solubility and processability, provides a new guide for developing highly efficient multi-purpose electronic materials for the next-generation of smart optoelectronic devices.
ISSN: 2567-3165
DOI: 10.1002/inf2.12345
DOI (Related Dataset): 10.21979/N9/HK6JJQ
Schools: School of Materials Science and Engineering 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2022 The Authors. InfoMat published by UESTC and John Wiley & Sons Australia, Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Fulltext Permission: open
Fulltext Availability: With Fulltext
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