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Optoelectronic devices

Illuminate the future with our Optoelectronic Devices research, where we pioneer advancements in solar photovoltaic technology, solid-state lighting, displays, and cutting-edge photo- and X-ray detectors, fostering innovation and efficiency in each beam of light.

Solar cells

Solar photovoltaic technology is one of the most promising solutions to minimizing our dependence on fossil fuel–based energy sources to meet net zero carbon emissions goals by 2050. Our focus is on development of thin film solar cells based on emerging advanced materials such as halide perovskites with power conversion efficiency (PCE) of over 25% which is competitive with today’s commercial crystalline silicon systems (~26% PCE). Furthermore, halide perovskite offers a novel opportunity to enhance the PCE of the market-dominating PV technologies based on c-Si and CIGS via tandem solar cells. However, Pb-toxicity and their short-term stability in particular being sensitive to the processing at the ambient condition poses serious obstacles to the widespread of this technology. Our team focuses on resolving these obstacles to advance these technologies via various approaches such as defect passivation[1], additive engineering[2], compositional[3] and interface modifications[4] as well as developing new device architectures for single-junction[5], tandem[6] and indoor photovoltaics.

[1] Mojtaba Abdi-Jalebi, et al., Samuel D. Stranks; “Maximising and Stabilising Luminescence in Metal Halide Perovskite Device”, Nature, 555, 497-501, (2018). [2] Mojtaba Abdi-Jalebi, et al., Michael Grätzel, Richard H. Friend; “Impact of Monovalent Cation Halide Additives on the Structural and Optoelectronic Properties of CH3NH3PbI3 Perovskite” Adv. Energy Mater., 6, 1502472 (2016). [3] Baodan Zhao, Mojtaba Abdi‐Jalebi, et al., Aditya Sadhanala; “High Open-Circuit Voltages in Tin-Rich Low-Bandgap Perovskite-Based Planar Heterojunction Photovoltaics”, Adv. Mater., 29, 1604744, (2017). [4] Mojtaba Abdi-Jalebi, et al., Michael Grätzel, Richard Friend; "Charge Extraction via Graded Doping of Hole Transport Layers Gives Highly Luminescent and Stable Metal Halide Perovskite Devices", Science Advances, Vol. 5, no. 2, eaav2012 (2019). [5] Narges Yaghoobi Nia, Mojtaba Abdi-Jalebi*, et al. , Aldo Di Carlo, “Beyond 17% Stable Perovskite Solar Module via Polaron Arrangement of Tuned Polymeric Hole Transport Layer”, Nano Energy, Volume 82, 105685 (2021). [6] Alan R Bowman, Mojtaba Abdi-Jalebi, et al., Samuel D Stranks, “Relaxed current matching requirements in highly luminescent perovskite tandem solar cells and their fundamental efficiency limits”, ACS Energy Lett., 6, 612–620, (2021).

Light Emitting Diodes (LEDs)

Solid-state lighting and displays are becoming ubiquitous in our daily lives, finding their place in televisions, cell phones, high-powered lamps, and many common consumer appliances[1]. Our team focuses on the design, fabrication, and characterisation of emerging light-emitting devices such as halide perovskite LEDs (PeLEDs) that offer sharper electroluminescence peaks than conventional inorganic and organic counterparts, making the PeLEDs particularly appealing for ultrahigh definition display applications. We implement various approaches to maximise and stabilise the electroluminescence efficiency at various emissions across the entire visible spectrum with a goal to produce low-cost, high quality white lights and ultra-high-resolution displays based on PeLEDs[2,3]

[1] D. Di, Mojtaba Abdi-Jalebi, et al., D. Credgington; "High-performance light-emitting diodes based on carbene-metal-amides", Science, 356 (6334), pp. 159-163 (2017). [2] Zahra Andaji‐Garmaroudi, Mojtaba Abdi‐Jalebi, et al., Samuel D Stranks, “Elucidating and Mitigating Degradation Processes in Perovskite Light‐Emitting Diodes”, Adv. Energy Mater., 2002676 (2020). [3] Shuai Yuan, et al., Mojtaba Abdi‐Jalebi, Richard H Friend, “Efficient and Spectrally Stable Blue Perovskite Light-Emitting Diodes Employing a Cationic π-Conjugated Polymer”, Adv. Mater., 33, 2103640 (2021).

Photo- and X-Ray detectors

Materials and technology development for designing innovative and efficient photo- and X-ray radiation detectors is of utmost importance for a wide range of applications ranging from security to medical imaging. We focus on the design, fabrication, and characterisation of emerging detectors primarily based on halide perovskites. The design and employment of stable, low disorder, and ambipolar perovskite thin films enables development of highly efficient thin film–based ionizing radiation detectors. Our work boosts the vision of thin, solution processed, large-area direct X-ray detectors operated at low bias and thus suitable for applications where lightweight, flexibility, and low-power supply are crucial, as in wearable electronics and space applications[1].

[1] Laura Basiricò, et al., Mojtaba Abdi‐Jalebi, Beatrice Fraboni, Henning Sirringhaus, “Detection of X-Rays by Solution-Processed Cesium-Containing Mixed Triple Cation Perovskite Thin Films”, Advanced Functional Materials, 29, 1902346 (2019).

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