1. 21.6%-efficient monolithic perovskite/Cu(In,Ga)Se2 tandem solar cells with thin conformal hole transport layers for integration on rough bottom bell surfaces
- Author
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Felix Lang, Bernd Rech, Marko Jošt, Marc Daniel Heinemann, Eike Köhnen, Christian A. Kaufmann, Steffen Braunger, Rutger Schlatmann, José A. Márquez, Amran Al-Ashouri, Dibyashree Koushik, Marcel A. Verheijen, Steve Albrecht, Thomas Unold, Tobias Bertram, Mariadriana Creatore, Iver Lauermann, Plasma & Materials Processing, Interfaces in future energy technologies, and Atomic scale processing
- Subjects
Solar cells of the next generation ,Materials science ,perovskites ,Energy Engineering and Power Technology ,Conformal map ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Materials Chemistry ,SDG 7 - Affordable and Clean Energy ,Perovskite (structure) ,Tandem ,Renewable Energy, Sustainability and the Environment ,business.industry ,Photovoltaic system ,Energy conversion efficiency ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,power conversion efficiency ,Fuel Technology ,Chemistry (miscellaneous) ,oxides ,solar cells ,Optoelectronics ,layers ,ddc:621 ,0210 nano-technology ,business ,621 Angewandte Physik ,SDG 7 – Betaalbare en schone energie - Abstract
Perovskite based tandem solar cells can increase the power conversion efficiency PCE of conventional single junction photovoltaic devices. Here, we present monolithic perovskite CIGSe tandem solar cells with a perovskite top cell fabricated directly on an as grown, rough CIGSe bottom cell. To prevent potential shunting due to the rough CIGSe surface, a thin NiOx layer is conformally deposited via atomic layer deposition on the front contact of the CIGSe bottom cell. The performance is further improved by an additional layer of the polymer PTAA at the NiOx perovskite interface. This hole transport bilayer enables a 21.6 stabilized PCE of the tandem device at amp; 8764;0.8 cm2 active area. We use TEM EDX measurements to investigate the deposition uniformity and conformality of the NiOx and PTAA layers. By absolute photoluminescence measurements, the contribution of the individual subcells to the tandem VOC is determined, revealing that further fine tuning of the recombination layers might improve the tandem VOC. Finally, on the basis of the obtained results, we give guidelines to improve monolithic perovskite CIGSe tandems toward predicted PCE estimates above 30
- Published
- 2019
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