Ultrathin PEDOT:PSS Enables Colorful and Efficient Perovskite Light-Emitting Diodes

Journal:Advanced Science
Abstract:Recently, metal halide perovskite light-emitting diodes (Pero-LEDs) have achieved significant improvement in device performance, especially for external quantum efficiency (EQE). And EQE is mostly determined by internal quantum efficiency of the emitting material, charge injection balancing factor (eta(c)), and light extraction efficiency (LEE) of the device. Herein, an ultrathin poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (UT-PEDOT:PSS) hole transporter layer is prepared by a water stripping method, and the UT-PEDOT:PSS can enhance eta(c) and LEE simultaneously in Pero-LEDs, mostly due to the improved carrier mobility, more matched energy level alignment, and reduced photon loss. More importantly, the performance enhancement from UT-PEDOT:PSS is quite universal and applicable in different kinds of Pero-LEDs. As a result, the EQEs of Pero-LEDs based on 3D, quasi-3D, and quasi-2D perovskites obtain enhancements of 42%, 87%, and 111%, and the corresponding maximum EQE reaches 17.6%, 15.0%, and 6.8%, respectively.
Indexed by:Journal paper
Discipline:Engineering
First-Level Discipline:Materials Science and Engineering
Volume:7
Issue:11
Page Number:2000689
ISSN No.:2198-3844
Translation or Not:no
Date of Publication:2020-04-13
Included Journals:SCI
DOI number:10.1002/advs.202000689
Impact Factor:14.3
Links to published journals:https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/advs.202000689

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