Copper(I) Iodide CAS 7681-65-4

As a wide bandgap straight bandgap p-type semiconductor material, CuI has a bandgap width of 3.1e V, a high transmittance in the visible light range (400nm-760nm), and a high carrier concentration and void space. Hole mobility, and the preparation method is simple and easy, less consumption of consumables, high preparation efficiency, non-toxic and non-polluting preparation process, so it has a wide range of application prospects in the field of semiconductor optoelectronic devices.

1) CuI film is used as a hole injection layer for light-emitting diodes (LEDs) and field-effect transistors
The CuI/Al composite layer can be used as the gate electrode of the organic semiconductor field effect transistor. CuI acts as a hole injection layer and can be directly in contact with the organic semiconductor layer. Compared with single-layer metal (gold or aluminum) as source and drain, CuI reduces the contact barrier between metal and organic semiconductor, which can improve hole mobility, improve carrier injection and transport efficiency, and improve current flow. The switching ratio can also sharply reduce the threshold voltage and reduce energy loss. Organic light-emitting diodes (OLEDs) are constructed, and CuI-doped NPB (alkane compounds) is used as the hole injection layer. Under the action of an external bias voltage, the transport efficiency of holes is improved, and the probability of electron recombination and light emission is increased, so that The current efficiency of the OLED increases to 69cd/A.

2) CuI is used as a hole transport layer for dye-sensitized solar cells (SSDC)
There are three main types of commonly used hole transport materials: organic polymer electrolytes, liquid electrolytes, and organic p-type semiconductor materials. Inorganic p-type semiconductor materials have stable performance, which can solve the two problems of easy degradation and aging of polymers and easy volatilization and decomposition of liquid substances, and improve the stability and service life of SSDC. CuI uses a hole transport layer between the transparent electrode and the dye to increase the potential barrier of electrons (block electrons from transporting to the anode) and reduce the potential barrier of holes. When sunlight irradiates dye molecules to generate electron-hole pairs, CuI increases the hole collection rate, reduces the electron-hole recombination rate, and improves the internal quantum efficiency, thereby achieving the purpose of improving light conversion efficiency. n-titanium dioxide (TiO2)∣organic matter∣p-CuI solid-state dye-sensitized solar cell, using p-CuI as the hole transport layer for the first time, with a photoelectric conversion efficiency of 0.8%; n-ZnO∣D-358 dye∣p-CuI solid-state Dye-sensitized solar cells have a photoelectric conversion efficiency as high as 3.2%. Polymerized solar cells (PSCs), with CuI as a buffer layer, achieved a photoelectric conversion efficiency of 3.84%.