LabANTI Research Group

Example Event

Sat, 01 Jun 2030 13:00:00 +0000

Slides can be added in a few ways:

Create slides using Wowchemy’s Slides feature and link using slides parameter in the front matter of the talk file
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Further event details, including page elements such as image galleries, can be added to the body of this page.

Example Event

Sat, 01 Jun 2030 13:00:00 +0000

Slides can be added in a few ways:

Create slides using Wowchemy’s Slides feature and link using slides parameter in the front matter of the talk file
Upload an existing slide deck to static/ and link using url_slides parameter in the front matter of the talk file
Embed your slides (e.g. Google Slides) or presentation video on this page using shortcodes.

Further event details, including page elements such as image galleries, can be added to the body of this page.

Efficient Non‐Fullerene Acceptor‐Based Organic Photodetectors Achieved by Reduced Deep Traps in Highly Intermixed Co‐Evaporated Bulk‐Heterojunction Blends

Sat, 01 Nov 2025 00:00:00 +0000

Breaking Crystallinity for Optimal Dark Current: Nonfullerene Acceptor Dilution as a Strategy for High-Performance Organic Photodetectors

Thu, 01 May 2025 00:00:00 +0000

Octupole moment driven free charge generation in partially chlorinated subphthalocyanine for planar heterojunction organic photodetectors

Sat, 01 Jun 2024 00:00:00 +0000

Key molecular perspectives for high stability in organic photovoltaics

Sun, 01 Oct 2023 00:00:00 +0000

The State-of-the-Art Solution-Processed Single Component Organic Photodetectors Achieved by Strong Quenching of Intermolecular Emissive State and High Quadrupole Moment in Non-Fullerene Acceptors

Fri, 01 Sep 2023 00:00:00 +0000

Interface engineering in perylene diimide-based organic photovoltaics with enhanced photovoltage

Mon, 01 May 2023 00:00:00 +0000

Molecular orientation-dependent energetic shifts in solution-processed non-fullerene acceptors and their impact on organic photovoltaic performance

Sat, 01 Apr 2023 00:00:00 +0000

The critical role of the donor polymer in the stability of high-performance non-fullerene acceptor organic solar cells

Sat, 01 Apr 2023 00:00:00 +0000

Contact

Mon, 24 Oct 2022 00:00:00 +0000

People

Mon, 24 Oct 2022 00:00:00 +0000

Tour

Mon, 24 Oct 2022 00:00:00 +0000

Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

Wed, 01 Jun 2022 00:00:00 +0000

Strong intermolecular interactions induced by high quadrupole moments enable excellent photostability of non‐fullerene acceptors for organic photovoltaics

Wed, 01 Jun 2022 00:00:00 +0000

Organic bilayer photovoltaics for efficient indoor light harvesting

Wed, 01 Dec 2021 00:00:00 +0000

Selenium-substituted non-fullerene acceptors: a route to superior operational stability for organic bulk heterojunction solar cells

Mon, 01 Mar 2021 00:00:00 +0000

Jian Yang and Monica Hall Win the Best Paper Award at Wowchemy 2020

Wed, 02 Dec 2020 00:00:00 +0000

Congratulations to Jian Yang and Monica Hall for winning the Best Paper Award at the 2020 Conference on Wowchemy for their paper “Learning Wowchemy”.

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Recent progress and challenges toward highly stable nonfullerene acceptor‐based organic solar cells

Tue, 01 Dec 2020 00:00:00 +0000

Richard Hendricks Wins First Place in the Wowchemy Prize

Tue, 01 Dec 2020 00:00:00 +0000

Congratulations to Richard Hendricks for winning first place in the Wowchemy Prize.

An example preprint / working paper

Sun, 07 Apr 2019 00:00:00 +0000

Create your slides in Markdown - click the Slides button to check out the example.

Add the publication’s full text or supplementary notes here. You can use rich formatting such as including code, math, and images.

Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices

Sat, 01 Dec 2018 00:00:00 +0000

An example conference paper

Mon, 01 Jul 2013 00:00:00 +0000

Click the Cite button above to demo the feature to enable visitors to import publication metadata into their reference management software.

Create your slides in Markdown - click the Slides button to check out the example.

Add the publication’s full text or supplementary notes here. You can use rich formatting such as including code, math, and images.

Mon, 01 Jan 0001 00:00:00 +0000

Organic Photodetectors

Mon, 01 Jan 0001 00:00:00 +0000

Organic photodetectors (OPDs) convert light signals carrying information into an electrical current. Light is typically absorbed in a photoactive layer based on a blend (i.e., bulk heterojunction) of two materials, an electron donor and an electron acceptor. In typical devices, the energy offset between two organic materials blended together provides the driving force to dissociate electrons and holes created under light (see the schematic above). To quantify the performance of OPDs, several figures of merit are utilized, such as:

External quantum efficiency (or responsivity): the ratio between how many electrons can be extracted from the device in response to photons hitting it
Dark current: parasitic electric current generated without a light signal, determining the device noise
Detectivity: combining the information of both quantum efficiency and dark current in a single figure of merit
Linear dynamic range: how many orders of magnitude of varying light intensity can generate an electrical signal linearly proportional to the light signal
Photodetector speed: how fast electrical signal can be extracted after light hits the device
Wavelength selectivity vs broadband: depending on OPD application, only photons of specific wavelengths or a wide spectral coverage can be targeted

In our lab, several aspects of OPDs are explored towards deeper understanding of their working mechanisms and improvement of performance and stability, for example:

How can we fabricate OPDs capable of harvesting infrared light? Can we push the photodetection to wavelengths beyond 1500-2000 nm?
How can we optimize molecular design of photoactive materials and architecture of device stack for maximum performance?
What is the origin of performance losses in OPDs? Especially, what loss mechanisms are involved when we target infrared photodetection?
How does OPD performance evolve when we operate in real-world conditions for long periods? Are OPDs stable?
What disruptive technologies can be demonstrated when we integrate infrared OPDs into more complex electronic circuits?

Organic Semiconductors

Mon, 01 Jan 0001 00:00:00 +0000

Organic optoelectronic devices utilize molecules based on a conjugated carbon backbone with other light elements (hydrogen, oxygen, sulfur…) where interactions between light and electrons can take place. For example:

Organic photodetectors generate an electrical signal in response to light shining on the molecules
Organic solar cells generate electrical power under a flow of light (from sun or artificial sources) on the molecules
Organic LEDs generate light when electrical current is injected into the molecules.

Compared to traditional silicon-based optoelectronic devices, organic materials (polymers and small molecules) offer exciting advantages, including:

Possibility of harvesting wavelengths where silicon cannot work (infrared >1100nm)
Fabrication is cheap and consumes little energy (e.g., by solution processing)
Large absorption coefficient: only small amount of material needed in the device, another bonus point towards sustainability
‘Unlimited’ options for tuning the optoelectronic properties of organic materials by chemical design (e.g., adding side-chains, modifying end groups or molecular core…)
Functional and esthetic features such as lightweight, flexibility/bendability, transparency, color-tunability
Compatibility with biological systems

The diagram above shows how light-to-electricity conversion works in organic semiconductors, where the photoactive layer is typically a blend of an electron donor (D) and an electron acceptor (A). When photons arrive on the device:

Light is absorbed and a bound electron-hole pair (exciton) is created in D and A domains
Excitons diffuse at the D/A interface
Thanks to the difference between D and A energy levels (HOMO and LUMO molecular orbitals) and interfacial charge transfer state is created, which is less bound than the original exciton
Electrons and holes are fully separated and extracted at the contacts

Despite the impressive leaps in organic device performance achieved in recent years, there are several challenges to overcome, which makes organic optoelectronics a highly interesting and stimulating fields for curious new researchers:

The low dielectric constant of organic materials results in a high binding energy between electrons and holes generated under light (i.e., excitons). This requires careful optimization of materials and device design to enhance charge dissociation
Organic materials are non-crystalline and prone to formation of traps and defects which limit device performance
Designing molecules with certain properties can be very complex for organic chemistry (e.g., far infrared absorbers)
Organic materials can be unstable and prone to degradation, especially when utilized in devices under electrical field, high temperatures, sunlight
It is not trivial to adapt the fabrication process for organic devices when moving to large-scale industrial production while preserving high performance (issues with reproducibility, large-area deposition, need for green solvents…)