Covalent, organic-functionalized interfaces offer the potential for robust, flexible, and tunable interfaces for a variety of applications including hetero-junction photovoltaics, organic field effect transistors, and optics. In the context of tandem-junction PV, we investigate low-temperature, monolayer functionalization of Si(111) with perylene derivatives to chemically and electrically tether MAPbI<sub>3</sub> thin films to the surface enabling flexible, carrier-selective interfaces. We covalently graft perylene dianhydride to surface via an imide linkage to surface-bound aniline. Secondary functionalization of the terminal anhydride with phenylenediamine yields A-type cation moieties that serve as a chemical hook for perovskite deposition. Ultraviolet Photoelectron Spectroscopy characterized the band-energy levels of functionalized surfaces. Transflection Infrared Spectroscopy and X-ray Photoelectron Spectroscopy probed each step of the surface functionalization and revealed high coverages of surface-attached perylenes. Current density-voltage measurements reveal that oxide-free, perylene-functionalized surfaces yielded improved energy conversion relative to aliphatic interfaces. We ascribe the efficiency improvements to reduced recombination and enhanced carrier transport. This work presents a bench top functionalization yielding soft, robust, electron transport layers to further integrate low-cost perovskites with mature silicon PV.<br/>

Enhanced transport and carrier selectivity at silicon/perovskite interfaces enabled by ordered perylene monolayers

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.