CMOS and beyond CMOS
Discover why imec is the premier R&D center for advanced logic & memory devices. anced logic & memory devices.
Connected health solutions
Explore the technologies that will power tomorrow’s wearable, implantable, ingestible and non-contact devices.
Life sciences
See how imec brings the power of chip technology to the world of healthcare.
Sensor solutions for IoT
Dive into innovative solutions for sensor networks, high speed networks and sensor technologies.
Artificial intelligence
Explore the possibilities and technologies of AI.
More expertises
Discover all our expertises.
Research
Be the first to reap the benefits of imec’s research by joining one of our programs or starting an exclusive bilateral collaboration.
Development
Build on our expertise for the design, prototyping and low-volume manufacturing of your innovative nanotech components and products.
Solutions
Use one of imec’s mature technologies for groundbreaking applications across a multitude of industries such as healthcare, agriculture and Industry 4.0.
Venturing and startups
Kick-start your business. Launch or expand your tech company by drawing on the funds and knowhow of imec’s ecosystem of tailored venturing support.
/Job opportunities/Improve the operational stability of perovskite solar cells

Improve the operational stability of perovskite solar cells

PhD - Genk | More than two weeks ago

How perovskite solar cells behave under working condition: Logical Perovskite engineering for highly stable working device.

Despite the easy and economical fabrication process and remarkable achievements trend in perovskite solar cells (PSCs), presently perovskite material is suffering sever degradation and lacking the long-term stability, which acts as barriers for its commercialization. Rapid decomposition of PSCs was found when exposed to prolonged humidity, heat, light, oxygen, etc. For instance, on account of the hydrophilic properties of perovskite, moisture can easily ingress and degrade the perovskite material which eventually generate excess PbI2 that will act as source of recombination. During light illumination the instabilities results from the week hydrogen bonding between organic cation and inorganic Pb-I frame work. Light exposure can break relatively weak bonds in either the perovskite or the commonly used contact layers, thereby generate halogen vacancy-halogen interstitial pairs that enable halogens to migrate, or convert any oxygen that might be present to highly reactive superoxide. These external factors such as high temperature or UV illumination can also contribute to the generation of vacancies in perovskite layer because the volatile component such as methylammonium (MA) leaves/migrates from the active layer and results in deterioration of crystal structure.

Till date, much scientific work had been done to improve the stability of perovskite photovoltaic, the operational stability of PSCs is far away from the silicon competitor in the photovoltaic market. What’s worse, researchers usually evaluated the stability of perovskite PV devices by storing them in a controlled environment and intermittently testing their efficiency. Unfortunately, the storage stability of the devices is not suitable for assessing the actual reason for material’s degradation during working condition as well as the longevity of operational device. During continuous operational process various factors such as (i) thermal effect (illumination/current), (ii) interfacial electric field and (iii) generation of excess charge carriers involved in PSCs degradation. Although extensive research has been carried out on instability of perovskite material however, during working condition the influence of various factors from external environment on mechanism of perovskite degradation in a device are not well explored.

In this project, we aim to improve the long-term operational stability of PSCs. As one of the pioneers in the development of thin-film organic solar cells, Thin-Film PV team at imec has state of the art facilities for testing operational device stabilities. In a broader sense, the PhD candidate in this project need to explore the operational stability of perovskite solar cells. Specifically, considering different environmental conditions, during operational state, various governing mechanisms in a device such as; (i) defect state dynamics, (ii) carrier loss mechanism, (iii) and interfacial physics of perovskite material will be explored. During continuous operation of PSCs, the influence of different environmental conditions on the stability of perovskite material is expounded and a possible solution that can effectively improve the operation stability of working device, will be explored.

The current project aims for the development of highly stable and efficient material composition by employing different routes like passivation engineering, interface engineering or composition engineering. This project involves the basic understanding of mechanism behind perovskite film formation and physics of defects as well as fabrication processes of devices will be researched. By using a wide range of stability characterization techniques, such as MPP testing and continuous illumination testing, will create various learning pathways for the candidate.

 

Required background: Semiconductor physics, Material science, Engineering science

Type of work: 60% experimental, 30% characterization, 10% literature

Supervisor: Jef Poortmans

Co-supervisor: Tom Aernouts

Daily advisor: Yinghuan Kuang

The reference code for this position is 2021-128. Mention this reference code on your application form.

This website uses cookies for analytics purposes only without any commercial intent. Find out more here. Our privacy statement can be found here. Some content (videos, iframes, forms,...) on this website will only appear when you have accepted the cookies.