University of Southern Denmark, Denmark
By Prof. Morten Madsen, University of Southern Denmark, Denmark
Interlayers play an important role in the development of both organic and hybrid solar cells, as they strongly influence not only device performance but also device stability, which have become the main focus area for these technologies [1]. Metal oxide layers have been demonstrated as an important class of materials for charge carrier extraction, where they in many cases serve as selective contact layers for efficient electron [2] or hole [3] transport. The introduction of non-fullerene (NFA) acceptors has set new requirements for the interlayers used in such systems. While the power conversion efficiencies of such NFA based organic solar cells recently has gone beyond 18% for single-junction devices, the device stability lacks behind, partly due to degradation effects taking place at the interface layers. In addition, it is well known that several degradation mechanisms taking place in perovskite solar cells are driven at the interface, making a thorough understanding of such interface effects highly important for both fields. In this presentation, recent progress made on metal oxide interlayers for NFA and perovskite solar cells will be discussed, and new results on sputtered and crystalline interlayers for organic and hybrid solar cells will be shown. This includes recent results on both hole and electron metal oxide transport layers developed by sputtering [2,3]. The potential for up-scaling of these new metal oxide interlayer systems from Roll-to-Roll (R2R) technology will finally be elaborated on [4].
1. M. Khenkin, et. al., “Consensus on ISOS Protocols for Stability Assessment and Reporting for Perovskite Photovoltaics” Nat. Energy, 5, 35 (2020)
2. M. Mirsafaei, P. B. Jensen, M. Ahmadpour, H. Lakhotiya, J. L. Hansen, B. Julsgaard, H.-G. Rubahn, R. Lazzari, N. Witkowski, P. Balling and M. Madsen, “Sputter-deposited titanium oxide layers as efficient electron selective contacts in organic photovoltaic devices” ACS Appl. Energy Mater, 3, 253 (2020)
3. M. Ahmadpour, A. L. F. Cauduro, C. Méthivier, B. Kunert, C. Labanti, R. Resel, V Turkovic, H.-G. Rubahn, N. Witkowski, A. K. Schmid and M. Madsen “Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices” ACS Appl. Energy Mater. 2, 420 (2019)
4. E. Destouesse, M. Top, J. Lamminaho, H.-G. Rubahn, J. Fahlteich and M. Madsen, “Slot-die processing and encapsulation of non-fullerene based ITO-free organic solar cells and modules” Flex. Print. Electron, 4, 045004 (2019)
Biography
Obtained his PhD degree in 2009 from the University of Southern Denmark (SDU), and was from 2010-2011 postdoc at UC Berkeley in Prof. Ali Javey research lab. Is since 2014 Associate Professor at SDU, where he is the Head of the OPV group and the SDU Roll-to-Roll facility. Coordinator and PI on a number of international and national projects, for example, the FP7 ITN project THINFACE, the EU Interreg 5A project RollFlex and the DFF FTP project React-PV. Main research interests within organic and hybrid photovoltaics, including a wide range of related material systems as well as device up-scaling from R2R technology. He holds more than 50 peer-reviewed publications in these topics and is co-editor of the book ‘Devices from Hybrid and Organic Materials’, part of the ‘World Scientific Reference of Hybrid Materials’ 2019 book series.