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In Vitro Multiparametric Cellular Analysis by Micro Organic Charge-modulated Field-effect Transistor Arrays

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Organic-Inorganic Charge Transfer Complex with Charge Modulation after Electrical Pre-biasing.

Dong Shen¹, Chunqing Ma¹, Tsz-Wai Ng¹

¹Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, People's Republic of China.

ACS Applied Materials & Interfaces

|July 25, 2020

Summary

Researchers developed a novel charge transfer complex (CTC) film using molybdenum(VI) oxide and pentacene. This film exhibits a controllable dipole, enabling significant current modulation and tuning of organic photovoltaic device performance.

Keywords:

charge modulation charge transfer complex dipole organic−inorganic pre-bias

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Area of Science:

Organic optoelectronics
Materials science
Charge transfer complexes (CTCs)

Background:

Recent advances in organic optoelectronic devices leverage novel properties of charge transfer complexes (CTCs).
CTCs are known for red-shifted energy gaps, but controllable dipoles have not been reported.

Purpose of the Study:

To investigate the controllable dipole properties of a molybdenum(VI) oxide and pentacene (MoO3:pentacene) CTC film.
To demonstrate the application of this controllable dipole in organic photovoltaic (OPV) devices.

Main Methods:

Fabrication of a MoO3:pentacene CTC film via coevaporation.
Electrical pre-biasing to control the dipole direction.
Characterization using Kelvin probe force microscopy.
Integration of the CTC layer into OPV devices.

Main Results:

The MoO3:pentacene CTC film exhibits a strong dipole (2.4 eV) with controllable direction via electrical pre-biasing.
Current modulation exceeding two orders of magnitude was achieved by controlling the dipole.
Surface potential modulation by an external electric field was confirmed.
Open circuit voltages (Voc) of OPV devices were significantly tuned by pre-biasing the CTC layer.

Conclusions:

A controllable dipole can be established within a CTC layer through electrical pre-biasing, a novel finding.
This controllable dipole mechanism offers a new strategy for enhancing the performance of organic optoelectronic devices, particularly OPVs.