Bhushan Kore, Oussama Er-raji, Oliver Fischer, Adrian Callies, Oliver Schultz-Wittmann, Patricia Samia Cerian Schulze, Martin Bivour, Stefaan De Wolf, Stefan W Glunz, Juliane Borchert
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引用次数: 0
Abstract
Fully textured perovskite silicon tandem solar cells effectively minimize the reflection losses and are compatible with industrial silicon production lines. To facilitate scalability and industrial deployment of perovskite silicon tandems all functional layers including perovskite need to be deposited with scalable techniques. Currently, self-assembling molecules (SAM), polymeric and low-molecular-weight organic semiconductors, are widely used as hole transport layers (HTLs) in p-i-n structured perovskite solar cells. Usually, SAMs are deposited via spin coating method, but use of this method could be challenging on large area textured silicon substrates, leading to inhomogeneous SAM layers and lossy HTL/perovskite interfaces. To address this issue, we have investigated thermal evaporation of SAMs (2PACz and Me-4PACz) and some other HTLs like TaTm and Spiro-TTB. We examined the effect of varying HTL thickness on the device performance and showed that the thickness of the thermally evaporated HTLs significantly affects the open circuit voltage (VOC) and fill factor (FF) of the solar cells. Furthermore, using ultraviolet photoemission spectroscopy and Suns-VOC measurements we correlate the changes observed in the VOC and FF with HTL thickness variations to the changes in the energy band positions (loss in the hole selectivity) and effective resistance losses, respectively. With the optimized HTL thickness we obtained ~30% efficiency on 1 cm2 area and ~26% on 4 cm2 area tandem devices.
期刊介绍:
Chemical Reviews is a highly regarded and highest-ranked journal covering the general topic of chemistry. Its mission is to provide comprehensive, authoritative, critical, and readable reviews of important recent research in organic, inorganic, physical, analytical, theoretical, and biological chemistry.
Since 1985, Chemical Reviews has also published periodic thematic issues that focus on a single theme or direction of emerging research.