Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.189
Publication date: 20th April 2022
Perovskite solar cells (PSCs) have been deeply studied for its growing photovoltaic performance
in various ways. Such achievement are due to fine optimization of the stacking layers and
experimenting in suitable device architecture. Use of interlayers has been in positive effect in the
fabrication process in improving the efficiency and other parameters. In the past couple of years,
self-assembled monolayers (SAM) have been subjected for use as an alternative or a replacement
as Hole Transport Layer (HTL)1. SAM has been in the limelight due to its efficient passivating
nature at the hole selective interface and a faster charge extraction2. Stability of PSCs is
fundamental to get reliable results that can be transferred to market potential, during the last years
standard stability procedure have been validated also for PSCs, suggesting that research
community must conduct stability tests to confirm the benefit of any kind of modification 3, 4. Here,
for the first time, we have introduced an interlayer small organic molecule 2-
decyl[1]benzothieno[3,2-b][1]benzothiophene (C10-BTBT ) over HTL self-assembled monolayer
(2-(3,6-Dimethoxy-9H-carbazol-9-yl) ethyl) phosphonic acid also known as Meo-2PACz. This
new usage of interlayer over SAM has shown a boost in efficiency giving a maximum power
conversion efficiency of 19.6%, with remarkable stability over light soaking test (ISOS L-1),
showing a T80 of 712h by using solution processable electron transport layers, such as Phenyl-C61-
butyric acid methyl ester (PCBM) and Bathocuproine (BCP), further proving the suitability of this
approach over industrial upscalable R2R technique. This approach can be extended as a common
procedure to reduce the non-radiative loss at the interface between hole selective contact SAM and
perovskite layer.
[1] Magomedov, Artiom, Amran Al‐Ashouri, Ernestas Kasparavičius, Simona Strazdaite, Gediminas Niaura,
Marko Jošt, Tadas Malinauskas, Steve Albrecht, and Vytautas Getautis. "Self‐assembled hole
transporting monolayer for highly efficient perovskite solar cells." Advanced energy materials 8, no. 32
(2018): 1801892.
[2] Choi, Kyoungwon, Hyuntae Choi, Jihyun Min, Taewan Kim, Dohyun Kim, Sung Yun Son, Guan-Woo Kim,
Jongmin Choi, and Taiho Park. "A Short Review on Interface Engineering of Perovskite Solar Cells: A
Self‐Assembled Monolayer and Its Roles." Solar RRL 4, no. 2 (2020): 1900251.
[3] Khenkin, Mark V., Eugene A. Katz, Antonio Abate, Giorgio Bardizza, Joseph J. Berry, Christoph Brabec,
Francesca Brunetti et al. "Consensus statement for stability assessment and reporting for perovskite
photovoltaics based on ISOS procedures." Nature Energy 5, no. 1 (2020): 35-49.
[4] Castriotta, Luigi Angelo, Rosinda Fuentes Pineda, Vivek Babu, Pierpaolo Spinelli, Babak Taheri, Fabio
Matteocci, Francesca Brunetti, Konrad Wojciechowski, and Aldo Di Carlo. "Light-Stable
Methylammonium-Free Inverted Flexible Perovskite Solar Modules on PET Exceeding 10.5% on a 15.7
cm2 Active Area." ACS Applied Materials & Interfaces 13, no. 25 (2021): 29576-29584.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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