| Full text | |
| Author(s): Show less - |
Yassitepe, Emre
;
Yang, Zhenyu
;
Voznyy, Oleksandr
;
Kim, Younghoon
;
Walters, Grant
;
Castaneda, Juan Andres
;
Kanjanaboos, Pongsakorn
;
Yuan, Mingjian
;
Gong, Xiwen
;
Fan, Fengjia
;
Pan, Jun
;
Hoogland, Sjoerd
;
Comin, Riccardo
;
Bakr, Osman M.
;
Padilha, Lazaro A.
;
Nogueira, Ana F.
;
Sargent, Edward H.
Total Authors: 17
|
| Document type: | Journal article |
| Source: | ADVANCED FUNCTIONAL MATERIALS; v. 26, n. 47, p. 8757-8763, DEC 20 2016. |
| Web of Science Citations: | 94 |
| Abstract | |
Cesium lead halide perovskite quantum dots (PQDs) have attracted significant interest for optoelectronic applications in view of their high brightness and narrow emission linewidth at visible wavelengths. A remaining challenge is the degradation of PQDs during purification from the synthesis solution. This is attributed to proton transfer between oleic acid and oleylamine surface capping agents that leads to facile ligand loss. Here, a new synthetic method is reported that enhances the colloidal stability of PQDs by capping them solely using oleic acid (OA). Quaternary alkylammonium halides are used as precursors, eliminating the need for oleylamine. This strategy enhances the colloidal stability of OA capped PQDs during purification, allowing us to remove excess organic content in thin films. Inverted red, green, and blue PQD light-emitting diodes (LED) are fabricated for the first time with solution-processed polymer-based hole transport layers due to higher robustness of OA capped PQDs to solution processing. The blue and green LEDs exhibit threefold and tenfold improved external quantum efficiency (EQE), respectively, compared to prior related reports for amine/ammonium capped cross-linked PQDs. The brightest blue LED based on all inorganic CsPb(Br1-xClx)(3) PQDs is also reported. (AU) | |
| FAPESP's process: | 14/18327-9 - Surface trap passivated colloidal quantum dots for application in p-n heterojunction thin film solar cells |
| Grantee: | Emre Yassitepe |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 13/16911-2 - Advanced spectroscopy of novel nanomaterials |
| Grantee: | Lázaro Aurélio Padilha Junior |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 13/05798-0 - An Investigation of Surface Trap Passivated Colloidal (Ag,Cu)(In,Ga)(Se,S)2 Nanoparticles for Thin Film Solar Cell Applications |
| Grantee: | Emre Yassitepe |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |