Institute of Functional Nano and Soft Materials, Soochow University
Liao Research Group
Device Engineering

In order to fabricate high-efficiency organic electronic devices, such as organic light-emitting diodes (OLEDs), organic solar cells (OSCs), and nano devices, several techniques and methods have been applied, including tandem structure, light extraction, exciton blocking, and interfacial modification, etc.

(1) Tandem Structure

We study OLEDs with tandem structure which stacks multiple EL units with transparent intermediate connectors in between. The use of tandem structure can increase the brightness as well as the lifetime in OLEDs.

(L.S. Liao et al. Appl. Phys. Lett. 84 (2004) 167-169.)

(2) Light Extraction

The 2D periodic nanoarrays are used for internal light extraction.

(X.B. Shi et al. J. Mater. Chem. C 3 (2015) 1666 .)

The TiO2 scattering layers are used for external light extraction.

(D.Y. Zhou et al. Appl. Surface Sci. 314 (2014) 858-863.)

(3) Exciton Blocking

The high efficiency OLEDs are fabricated by using a double exciton blocking layer between the hole transporting layer and the emitting layer. The excitons are effectively confined in the emitting layers and the device lifetime is improved by two times by the double exciton blocking layer.

(C.H. Gao et al. Org. Electron. 14 (2013) 1177-1182.)

(4) Electrode Modification

We use several methods to improve the work function of ITO followed by the efficient hole injection and carrier balance.

(C.H.Gao et al. ACS Appl.Mater. Interfaces 4 (2012) 5211-5216.)

(5) High Efficiency Perovskite Solar Cells

By using new hole and electron extracton layers, the perovskite solar cells with a simple panlar structure can achieve high power conversion efficiency (PEC).

(M. Li et al. In submission.)