Solution processed bismuth oxyiodide (BiOI) thin films and solar cells

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Post-transition metal chalcohalides are promising semiconductors for optoelectronics.
• Bismuth oxyiodide (BiOI) offers environmental stability, low toxicity, and defect tolerance.
• The 'ns²' electronic configuration contributes to BiOI's desirable material properties.

Purpose of the Study:

• To develop solution-processed bismuth oxyiodide (BiOI) thin films.
• To fabricate the first all-inorganic solar cells using solution-processed BiOI.
• To enhance solar cell performance through templated BiOI film growth.

Main Methods:

• Fabrication of BiOI thin films via a solution-processed method.
• Construction of all-inorganic solar cells with an ITO/NiO/BiOI/ZnO/Al architecture.
• Templating BiOI thin film growth to optimize device performance.

Main Results:

• Achieved pin-hole free, highly pure BiOI films without contaminants.
• Successfully fabricated solution-processed all-inorganic solar cells based on BiOI.
• Templated BiOI films led to efficiencies comparable to vacuum-deposited devices.

Conclusions:

• Solution-processed BiOI thin films are a viable alternative to vacuum-deposited materials.
• These BiOI films and devices represent a significant advancement for optoelectronics.
• This work provides a platform for developing future bismuth chalcohalide-based optoelectronic devices.