Holistic Approach Towards Fully Semi-transparent 21 cm2 Perovskite Solar Module with 9.5% Efficiency
Monika Rai a, Zhengtian Yuan b, Anupam Sadhu b, Shin Woei Leow b, Lioz Etgar b c, Shlomo Magdassi b c, Lydia Helena Wong b
a Institute for Photovoltaics (ipv), University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany
b School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
c The Hebrew University of Jerusalem, The Institute of Chemistry, Casali Center of Applied Chemistry, Edmond J. Safra Campus Givat Ram, Jerusalem, Israel
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Monika Rai, presentation 053
DOI: https://doi.org/10.29363/nanoge.hopv.2022.053
Publication date: 20th April 2022

The staggering rise in perovskite solar cells efficiency in past years has led to more advancements in the direction of large area scalability. However, for potential application in building-integrated photovoltaics (BIPV), the visible semi-transparent large-area perovskite devices are still not well-explored as they involve additional challenges in device design, fabrication, and long-term stability. This addresses the challenges and provide potential solutions to the losses incurred during the fabrication of semi-transparent large area perovskite solar module and reports the highest efficiency on this area and architecture.

The highlights of the work include:

1. Europium ions, doped in the perovskite, are found to suppress the generation of detrimental species like elemental Pb and I, resulting in higher atmospheric stability.

2. The effect of top transparent contact is designed to obtain the average visible transparency (AVT) of >20% for full device and green colored hue.

3. Lastly, the lower current density due to the thinner absorber is enhanced by the down-converting phosphor material in addition to reduced UV-induced degradation.

This holistic approach on planar n-i-p architecture renders a high efficiency of 9.5% on 21 cm2 module ensuring aesthetics and AVT> 20%. Under low light illumination, which is relevant for indoor/diffused light conditions, the efficiency is 12.5%. The exceptional operational stability of ~ 300 h in ambient atmosphere is obtained.

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