Photovoltaic Materials and Devices:
Our research activities are focused on the physics of organic and, more recently, hybrid perovskite photovoltaics. Perovskite photovoltaics is a relatively new type of thin-film PV technology, which experienced a tremendous increase in power conversion efficiency from 3.8 % to above 22 % within the last 10 years.
Solar cells can be easily made from solution in our laboratories, whereas on industrial scale they can even be produced via large-area, roll-to-roll printing. These features of high efficiency and low-cost make the hybrid perovskite solar cells to a promising candidate for future PV applications attracting many PV research groups all around the world.
Our PV group concentrates its experimental activities at understanding the fundamental working principles of organic and hybrid perovskite solar cells, such as charge carrier transport, charge carrier extraction as well as the recombination dynamics of charge carriers. Another important related topic is the analysis of structural defects and dopants in organic and hybrid semiconductors and their impact on the performance of the optoelectronic and photovoltaic devices.
Many different complementary experimental techniques are available to probe the cw- and transient optical, electrical as well magnetic properties of active layers as well as fully processed solar cell devices.
Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport and Recombination
Y. Hu, E. M. Hutter, P. Rieder, I. Grill, J. Hanisch, M. F. Aygüler, A. G. Hufnagel, M. Handloser, E. Ahlswede, Th. Bein, A. Hartschuh, K. Tvingstedt, V. Dyakonov, A. Baumann, T. J. Savenije, M. L. Petrus, P. Docampo
Adv. Energy Mater. 1703057 (2018) [DOI: 10.1002/aenm.201703057]
Revisiting lifetimes from transient electrical characterization of thin film solar cells; a capacitive concern evaluated for silicon, organic and perovskite devices
D. Kiermasch, A. Baumann, M. Fischer, V. Dyakonov, K. Tvingstedt
Energy & Environmental Science (2018) [DOI: 10.1039/C7EE03155F]
Impact of Interfaces and Laser Repetition Rate on Photocarrier Dynamics in Lead Halide Perovskites
L. G. Kudriashova, D.Kiermasch, P. Rieder, M. Campbell, K. Tvingstedt, A. Baumann, G. V. Astakhov, V. Dyakonov
J. Phys. Chem. Lett. 8, 4698−4703 (2017), [DOI: 10.1021/acs.jpclett.7b02087]
Removing Leakage and Surface Recombination in Planar Perovskite Solar CellsKristofer Tvingstedt, Lidón Gil-Escrig, Cristina Momblona, Philipp Rieder, David Kiermasch, Michele Sessolo, Andreas Baumann, Henk J. Bolink and Vladimir Dyakonov,
ACS Energy Lett. 2, 424 (2017), [DOI: 10.1021/acsenergylett.6b00719]
Improved charge carrier lifetime in planar perovskite solar cells by bromine doping
David Kiermasch, Philipp Rieder, Kristofer Tvingstedt, Andreas Baumann, Vladimir Dyakonov
Sci. Rep., 6, 39333 (2016), [DOI:10.1038/srep39333]
Identification of Trap States in Perovskite Solar Cells
Andreas Baumann, Stefan Väth, Philipp Rieder, Michael Heiber, Kristofer Tvingstedt, Vladimir Dyakonov
J. Phys. Chem. Lett. 6, 2350 (2015), [DOI:10.1021/acs.jpclett.5b00953]
Radiative Efficiency of Lead Iodide Based Perovskite Solar Cells
Kristofer Tvingstedt, Olga Malinkiewicz, Andreas Baumann, Carsten Deibel, Henry J. Snaith, Vladimir Dyakonov and Henk J. Bolink
Sci. Rep. 4, 6071 (2014), [DOI:10.1038/srep06071]
Persistent Photovoltage in Methylammonium Lead Iodide Perovskite Solar Cells
A. Baumann, K. Tvingstedt, M. C. Heiber, S. Väth, C. Momblona, H. J. Bolink, V. Dyakonov
APL Mater. 2, 081501 (2014), [DOI:10.1063/1.4885255], [arXiv:1406.4276]