Dr. Mahnaz Davoudzadeh Gholami Profile

Dr. Mahnaz Davoudzadeh Gholami

at Queensland Univ of Technology

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Proceedings Article | 28 September 2023 Poster + Paper

Low bandgap donor-acceptor-donor-based TPA-azaBODIPY-TPA small molecule for flexible near-infrared organic photodetectors

Gurudutt Bhat, Marcin Kielar, Mahnaz Gholami, Pankaj Sah, Ajay Pandey, Prashant Sonar

Proceedings Volume 12661, 1266107 (2023) https://doi.org/10.1117/12.2677285

KEYWORDS: Near infrared, Photodetectors, Glasses, Optoelectronics, Organic photodetectors, Dark current, Photocurrent, Molecules

Read Abstract +

Organic photodetectors (OPDs) hold great promise for use in flexible electronics as they can be designed on substrates featuring various shapes and using cost-effective solution-processed methods. Organic conjugated materials offering two or more distinct optoelectronic functions are especially appealing here as they provide multifunctionality while also retaining the ease of fabrication and low-cost advantage. One such material is TPA-azaBODIPY-TPA that has been shown to feature ideal charge transfer properties and excitation energy levels. In our recent work, we demonstrated the versatile nature of this material acting as either a charge transport interlayer in perovskite solar cells, or as a light-absorbing layer in OPDs. TPA-azaBODIPY-TPA-based solar cellsshowed a 60 % increase in power conversion efficiency when compared to a control device using a conventional interlayer PEDOT:PSS. Having also demonstrated the successful utilization of TPA-azaBODIPY-TPA in OPDs manufactured on glass substrates, we further explore its applications in the design and fabrication of flexible OPDs for near-infrared sensing. Fabricated devices on flexible substrates show a near-infrared spectral responsivity of 49 mA W-1 at 730 nm, a high linear dynamic range of 110 dB and fast temporal responses below 100 μs. With robust thermal stability as well as excellent solubility and processability, TPA-azaBODIPY-TPA is found to be perfect candidate for the next-generation of smart optoelectronic flexible devices.

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