Photocatalytic Polymerization of 3,4-Ethylenedioxythiophene over Cesium Lead Iodide Perovskite Quantum Dots

Abstract

The outstanding performance of halide perovskites in optoelectronic applications can be partly attributed to their high absorption coefficient and long carrier lifetime, which are also desirable for photocatalysts. Herein, we report that cesium lead iodide perovskite quantum dots (CsPbI QDs) can be used as catalysts to promote the polymerization of 2,2',5',2″-ter-3,4-ethylenedioxythiophene under visible light illumination while preserving the quantum dot in the desirable cubic crystal phase. Simultaneously, the generated conducting poly(3,4-ethylenedioxythiophene), PEDOT, encapsulates and stabilizes the morphology of the CsPbI QDs. The photocatalytic polymerization clearly depends on the concentration of the CsPbI QDs, and the CsPbI QDs maintain the desirable perovskite phase when the concentration of the QD increases. Molecular oxygen and 1,4-benzoquinone can serve as electron acceptors during the photocatalytic polymerization reaction. When molecular oxygen is used, the structure of the CsPbI QD transforms from cubic to orthorhombic, while usage of 1,4-benzoquinone preserves the cubic phase of CsPbI QD. This novel approach enables the one-step formation of CsPbI/PEDOT composite, which could be promising for the preparation of novel optoelectronic materials and high performance devices.

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

“…an EQE of 3.0% and a maximum luminance of 330 cd m −2 for the CsPbBr 3 QDs‐based green LED, an EQE of 1.9% and a maximum luminance of 35 cd m −2 for the CsPbBr x Cl 3− x QDs‐based blue LED) ( Figure a–d) . Li et al further enhanced the EQE of all‐inorganic halide perovskite QDs‐based LEDs to 6.27% by balancing surface passivation and carrier injection via ligand density control, which is over 50‐fold higher than the first reported value (0.12%) of CsPbBr 3 QD‐based LEDs . The composition engineering has been regarded as another effective way to improve the performance of perovskite QDs‐based LEDs.…”

“…In another work, the CsPbI 3 QDs were used as catalysts to promote the polymerization of 2,2′,5′,2″‐ter‐3,4‐ethylenedioxythiophene (TerEDOT) under visible light illumination (Figure f). It is noteworthy that the CsPbI 3 QDs exhibited phase stability with cubic crystal structure well‐maintained after the photocatalytic process . It is worth pointing out further improving the catalytic performance while simultaneously considering the stability of the catalytic cycle/system will still be two main research directions in this field.…”

“…f) Illustration of the proposed mechanism for photocatalytic polymerization of TerEDOT using CsPbI 3 QDs under visible light illumination. Reproduced with permission . Copyright 2017, American Chemical Society.…”

Encapsulating Perovskite Quantum Dots in Iron‐Based Metal–Organic Frameworks (MOFs) for Efficient Photocatalytic CO2 Reduction

“…[17][18][19][20] In this regard, lead halide perovskite (LHP) NCs are ordinarily endowed with high defect tolerance and long photogenerated carrier lifetime,t riggering their widespread applications in photovoltaic and optoelectronic devices. [24][25][26][27][28][29][30][31][32][33] In photocatalytic CO 2 reduction, LHP QDs have been demonstrated to be capable of converting CO 2 into CO and CH 4 . [24][25][26][27][28][29][30][31][32][33] In photocatalytic CO 2 reduction, LHP QDs have been demonstrated to be capable of converting CO 2 into CO and CH 4 .…”

Anorganische CsPbX3‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

“…[106,107] Das wichtigste Merkmal der CsPbI 3 -QD-Schichten ist jedoch ihre grçßere Phasenstabilitäti mr einen Zustand (Monate in der Umgebungsluft) im Vergleich zu polykristallinen Schichten, wie sie von Swarnkar et al beschrieben wurden. [106,107] Das wichtigste Merkmal der CsPbI 3 -QD-Schichten ist jedoch ihre grçßere Phasenstabilitäti mr einen Zustand (Monate in der Umgebungsluft) im Vergleich zu polykristallinen Schichten, wie sie von Swarnkar et al beschrieben wurden.…”