研究目的
To enhance the performance of perovskite light-emitting diodes (Pero-LEDs) by developing an ultrathin poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (UT-PEDOT:PSS) hole transporter layer that improves charge injection balancing factor (ηc) and light extraction efficiency (LEE) simultaneously.
研究成果
The UT-PEDOT:PSS significantly enhances the performance of Pero-LEDs by improving charge injection balancing and light extraction efficiency. This method is universal and applicable to various color-emitting Pero-LEDs, achieving maximum EQEs of 17.6%, 15.0%, and 6.8% for devices based on 3D, quasi-3D, and quasi-2D perovskites, respectively. The work provides a pathway to bridge the gap between Pero-LEDs and other mature technologies.
研究不足
The study focuses on the enhancement of EQE through the use of UT-PEDOT:PSS but does not extensively address the operational stability of Pero-LEDs compared to other mature technologies like OLEDs and quantum dot LEDs. The method's applicability to other types of perovskite materials or device architectures is not fully explored.
1：Experimental Design and Method Selection:
The study involved preparing an ultrathin PEDOT:PSS (UT-PEDOT:PSS) HTL by a water stripping method to replace the conventional thick PEDOT:PSS HTL in Pero-LEDs. The methodology included optical simulations with the Chance–Prock–Silbey (CPS) model using Setfos software for evaluating the influence of PEDOT:PSS thickness on LEE.
2：Sample Selection and Data Sources:
Pero-LEDs with different interfaces of perovskite and substrates (perovskite/PEDOT:PSS, perovskite/ITO, and perovskite/UT-PEDOT:PSS) were prepared. The thickness of PEDOT:PSS and UT-PEDOT:PSS was measured using film thickness gauges.
3：List of Experimental Equipment and Materials:
Equipment included film thickness gauges (ThetaMetrisis FR-pRo VIS/NIR), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectrometer (UPS), ellipsometer (Horiba UVISEL), and scanning electron microscope (SEM). Materials included PEDOT:PSS, ITO, perovskite, B3PYMPM, LiF, and Al.
4：Experimental Procedures and Operational Workflow:
The UT-PEDOT:PSS was prepared by water stripping treatment, reducing the thickness from
5：7 to 9 nm. The properties of the films were analyzed using AFM, XPS, and UPS. Pero-LEDs were fabricated with a general structure (ITO/HTL(PEDOT:
PSS/UT-PEDOT:PSS)/perovskite/B3PYMPM/LiF/Al), and their performance was evaluated.
6：Data Analysis Methods:
The optical constants and electroluminescence (EL) spectrum of perovskite were integrated into the Setfos model for simulation. Power dissipation channels of the Pero-LEDs were examined to evaluate the LEE.
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