scholarly journals Surface Ligand Management Aided by a Secondary Amine Enables Increased Synthesis Yield of CsPbI 3 Perovskite Quantum Dots and High Photovoltaic Performance

2020 ◽  
Vol 32 (32) ◽  
pp. 2000449 ◽  
Author(s):  
Yao Wang ◽  
Jianyu Yuan ◽  
Xuliang Zhang ◽  
Xufeng Ling ◽  
Bryon W. Larson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Secondary Amine ◽  
Photovoltaic Performance ◽  
Perovskite Quantum Dots ◽  
Surface Ligand ◽  
Synthesis Yield

scholarly journals Reducing the Photodegradation of Perovskite Quantum Dots to Enhance Photocatalysis in CO2 Reduction

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Hanleem Lee ◽  
Meeree Kim ◽  
Hyoyoung Lee
Keyword(s):  
Quantum Dots ◽  
Chemical Stability ◽  
Single Photon ◽  
Co2 Reduction ◽  
Critical Factor ◽  
Surface Binding ◽  
Ni Doping ◽  
Co Catalyst ◽  
Perovskite Quantum Dots ◽  
Surface Ligand

Solution-processed perovskite quantum dots (QDs) have been intensively researched as next-generation photocatalysts owing to their outstanding optical properties. Even though the intrinsic physical properties of perovskite QDs have been significantly improved, the chemical stability of these materials remains questionable. Their low long-term chemical stability limits their commercial applicability in photocatalysis. In this study, we investigated the photodegradation mechanisms of perovskite QDs and their hybrids via photoluminescence (PL) by varying the excitation power and the ultraviolet (UV) exposure power. Defects in perovskite QDs and the interface between the perovskite QD and the co-catalyst influence the photo-stability of perovskite QDs. Consequently, we designed a stable perovskite QD film via an in-situ cross-linking reaction with amine-based silane materials. The surface ligand comprising 2,6-bis(N-pyrazolyl)pyridine nickel(II) bromide (Ni(ppy)) and 5-hexynoic acid improved the interface between the Ni co-catalyst and the perovskite QD. Then, ultrathin SiO2 was fabricated using 3-aminopropyltriethoxy silane (APTES) to harness the strong surface binding energy of the amine functional group of APTES with the perovskite QDs. The Ni co-catalyst content was further increased through Ni doping during purification using a short surface ligand (3-butynoic acid). As a result, stable perovskite QDs with rapid charge separation were successfully fabricated. Time-correlated single photon counting (TCSPC) PL study demonstrated that the modified perovskite QD film exhibited slow photodegradation owing to defect passivation and the enhanced interface between the Ni co-catalyst and the perovskite QD. This interface impeded the generation of hot carriers, which are a critical factor in photodegradation. Finally, a stable red perovskite QD was synthesized by applying the same strategy and the mixture between red and green QD/Ni(ppy)/SiO2 displayed an CO2 reduction capacity for CO (0.56 µmol/(g∙h)).

Hydrophobic stabilizer-anchored fully inorganic perovskite quantum dots enhance moisture resistance and photovoltaic performance

Nano Energy ◽  
2020 ◽  
Vol 75 ◽  
pp. 104985 ◽  
Author(s):  
Jigeon Kim ◽  
Sinyoung Cho ◽  
Filip Dinic ◽  
Jongmin Choi ◽  
Changsoon Choi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photovoltaic Performance ◽  
Moisture Resistance ◽  
Inorganic Perovskite ◽  
Perovskite Quantum Dots

Perovskite Quantum Dots: Opportunities and Challenges

2020 ◽  
Vol 41 (8) ◽  
pp. 940-944
Author(s):  
ZENG Hai-bo ◽  
◽  
DONG Yu-hui ◽  
Keyword(s):  
Quantum Dots ◽  
Perovskite Quantum Dots

scholarly journals Achieving Optical Gain of the CsPbBr3 Perovskite Quantum Dots and Influence of the Variable Stripe Length Method

ACS Omega ◽  
2021 ◽  
Author(s):  
Saif M. H. Qaid ◽  
Hamid M. Ghaithan ◽  
Bandar Ali Al-Asbahi ◽  
Abdullah S. Aldwayyan
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Perovskite Quantum Dots ◽  
Stripe Length
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