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Title: | Quasi-2D Hybrid Perovskite Formation Using Benzothieno[3,2-b]Benzothiophene (BTBT) Ammonium Cations: Substantial Cesium Lead(II) Iodide Black Phase Stabilization | Authors: | DENIS, Paul-Henry Mertens, Martijn VAN GOMPEL, Wouter MAUFORT, Arthur MERTENS, Sigurd Wei, ZM VAN LANDEGHEM, Melissa GIELEN, Sam RUTTENS, Bart Deduytsche, D Detarvernier, C LUTSEN, Laurence Grozema, F VANDEWAL, Koen VANDERZANDE, Dirk |
Issue Date: | 2022 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | Advanced Optical Materials, 10 (18) (Art N° 2200788) | Abstract: | 3D hybrid perovskites (APbX(3)) have made a significant impact on the field of optoelectronic materials due to their excellent performance combined with facile solution deposition and up-scalable device fabrication. Nonetheless, these materials suffer from environmental instability. To increase material stability, the organic cation (A) is substituted by the non-volatile cesium cation. However, the desired photoactive cesium lead(II) iodide black phase is metastable in ambient conditions and spontaneously converts into the photo-inactive yellow delta-phase. In this work, the black phase is stabilized by the formation of a quasi-2D perovskite containing a benzothieno[3,2-b]benzothiophene (BTBT) large organic ammonium cation. Thermal analysis shows that degradation of the butylammonium (BA)-based quasi-2D perovskite (BA)(2)CsPb2I7 sets in at approximate to 130 degrees C, while (BTBT)(2)CsPb2I7 is phase-stable until approximate to 230 degrees C. Additionally, the (BTBT)(2)CsPb2I7 film does not show any sign of degradation after exposure to 77% Relative Humidity in the dark for 152 days, while (BA)(2)CsPb2I7 degrades in a single day. Photoconductor-type detectors based on (BTBT)(2)CsPb2I7 demonstrate an increased external quantum efficiency and a similar specific detectivity compared to the BA-based reference detectors. The results demonstrate the utility of employing a BTBT cation within the organic layer of quasi-2D perovskites to significantly enhance the stability while maintaining the optoelectronic performance. | Keywords: | cesium black phase stabilization;low-dimensional perovskites;moisture stability;photodetectors;thermal stability | Document URI: | http://hdl.handle.net/1942/39034 | ISSN: | 2195-1071 | e-ISSN: | 2195-1071 | DOI: | 10.1002/adom.202200788 | ISI #: | WOS:000815023800001 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2023 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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Quasi-2D hybrid perovskite formation using benzothieno[3,2-b]benzothiophene (BTBT) ammonium cations.pdf | Peer-reviewed author version | 5 MB | Adobe PDF | View/Open |
Advanced Optical Materials - 2022 - Denis - Quasi‐2D Hybrid Perovskite Formation Using Benzothieno 3 2‐b Benzothiophene .pdf Restricted Access | Published version | 5.31 MB | Adobe PDF | View/Open Request a copy |
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