Postdoc Contact Materials and Photoelectron Spectroscopy for Perovskite Solar Cells (m/w/d)

Stellenbeschreibung

Postdoc (f/m/d) Contact Materials and Photoelectron Spectroscopy for
Perovskite Solar Cells

Reference No.: SE 2024/21

At HZB’s Department for Perovskite Tandem Solar Cells, we develop metal
halide perovskite solar cells and have achieved several world record
efficiencies for perovskite-silicon (32.5%) and perovskite-CIGS (24.2%) tandem
solar cells in the past years. Developing novel perovskite and contact layers,
and investigating fundamental properties of the films and their interfaces, is
key to understanding efficiency limiting factors.

As a highly motivated postdoc with experience in materials research for
(perovskite-)photovoltaics, thin-film deposition, photoelectron spectroscopy
(PES) and related analytical methods, you will conduct research on materials
for cutting edge perovskite and tandem solar cells.

Using a recently commissioned integrated UHV tool with an evaporator / sputter
chamber for device-relevant sample sizes and state-of-the-art PES analytics
(XPS, UPS, Near-UV PES), you will develop novel vacuum-processed electron- and
hole-selective contact layers as well as passivating and/or protective
interlayers. Working in a team of ~20 postdocs, master‘s and doctoral
students in our international and multidisciplinary group, you will integrate
the developed layers into single junction and tandem solar cells based on our
state-of-the-art solution- and vacuum-processed perovskite films.

Your Tasks

You will...

* work with our team and screen the literature to assess limitations of
today’s electron- and hole-selective contact layers, passivation layers
and protective buffers for perovskite solar cells,
* develop vacuum deposition processes for improving existing or establishing
alter­native thin films with these functionalities, using thermal
evaporation and sputtering techniques,
* use standard XPS, UPS and special near-UV photoelectron spectroscopy (NUPS,
CFSYS) developed at HZB to elucidate valence band and defect state densities of
materials and interfaces, and to determine band offsets at heterojunctions,
* characterize the optical and electronic properties of these films, applying
suitable material characterization methods such as reflection / transmission,
ellipsometry electrical conductivity, spectral and time-resolved
photoluminescence, XRD etc.,
* collaborate with group members to integrate the developed films into
perovskite single-junction and perovskite / silicon tandem solar cells.
Your Profile

* Completed doctorate in physics, materials science, chemistry or a
comparable field of study
* In-depth knowledge of the theory, practice, and data analysis of
photoelectron spectroscopy with X-ray and UV excitation (XPS, UPS)
* Good knowledge of semiconductor technology and the physics of solar cells
* Excellent analytical, communication and organizational skills
* Enthusiasm for solar cells, with a drive for deeply understanding their
working mechanisms
* Team spirit
Your Benefits at HZB

* A unique opportunity to investigate materials for the next generation of
photovoltaics
* Advanced analytical laboratories, including the Berlin electron synchrotron
BESSY II
* State-of-the-art device processing equipment maintained by experienced
engineers
* The opportunity to optimize industry-relevant processes for the next
generation of photovoltaics
* A growing (> 20 people), highly motivated group with a pleasant
atmosphere, supportive environment, and regular social activities
* Training programmes, career advice, specific training courses and
networking opportunities organised by theGraduate Centre

andPostdoc Office

* Compatibility of work and private life through the support of flexible
working time models and the option of mobile working, as well as extensive
counselling services on family and career
* 39 hours/week and 30 days holiday/year
* Company health promotion and company sports programmes
* Subsidy for public transport (Deutschlandticket Job)
* Company pension scheme (VBL)
* And a team that looks forward to meeting you!
Fixed term contract for 36 months. The salary is based on the Collective
Agreement for the German Public Service (TVöD-Bund).

How to apply

We look forward to receiving your application via our application management
system by29.09.2024. For reasons of data protection regulations, we are
unfortunately unable to consider applications that reach us by other means
(such as email or mail) in the application process.

We very much want our workplace to be diverse, and welcome applications from
people with different backgrounds. It is our mission to promote equal
opportunities and to improve women’s representation in the workforce. We
are therefore very interested in receiving applications from women. Where the
qualifications are met, we will give preference to people with disabilities.

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Hahn-Meitner-Platz 1, 14109 Berlin
www.helmholtz-berlin.de

➜ APPLY HERE!

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CONTACT

Dr. Lars Korte
+49 30 8062 41351
korte@helmholtz-berlin.de

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Helmholtz-Zentrum Berlin für Materialien und Energie GmbH