Citation: LIU Ji-Chong, TANG Feng, YE Feng-Ye, CHEN Qi, CHEN Li-Wei. Visualization of Energy Band Alignment in Thin-Film Optoelectronic Devices with Scanning Kelvin Probe Microscopy[J]. Acta Physico-Chimica Sinica, ;2017, 33(10): 1934-1943. doi: 10.3866/PKU.WHXB201715185 shu

Visualization of Energy Band Alignment in Thin-Film Optoelectronic Devices with Scanning Kelvin Probe Microscopy

LIU Ji-Chong ^1,2, ,
TANG Feng ^1,2 ,
YE Feng-Ye ^1,3 ,
CHEN Qi ¹ ,
CHEN Li-Wei ¹

1.
i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu Province, P. R. China;
2.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3.
Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 13 April 2017
Revised Date: 16 May 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21625304, 51473184 and 11504408), Ministry of Science and Technology of China (2016YFA0200703), the CAS Research Equipment Development Program (YZ201654).

Understanding the energy band alignment across multiple layers in thin-film optoelectronic devices is extremely important because it governs elementary optoelectronic processes, such as charge carrier generation, separation, transport, recombination and collection. This monograph summarizes recent progress in visualization of energy band alignment in thin-film optoelectronic devices, such as organic solar cells (OSCs) and organic-inorganic perovskite photodetectors from our group by using scanning Kelvin probe microscopy (SKPM). Since active layers are enclosed by the top and bottom electrodes in vertically stacked devices, it is highly challenging to study the energy band alignment under operando conditions. Thus, cross-sectional SKPM has been developed to resolve this challenge. The results demonstrated that the interlayer was one of the most important factors for adjusting energy band alignment, determining device polarity and improving device performance. The characterization methods described in this monograph are poised to be widely applied to research in various thin-film optoelectronic devices, such as photovoltaic devices, photodetectors and light-emitting diodes (LEDs), especially those devices with tandem structures.
- Scanning Kelvin probe microscopy,
- Energy band alignment,
- Cross-section,
- Interlayer Organic solar cells,
- Organic-inorganic perovskite photodetectors,
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