Structural modification enhances the optoelectronic properties of defect blue phosphorene thin films

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Improving light conversion efficiency in thin-film solar cells is essential for next-generation devices.
• Active enhancement of optical absorption is a key strategy for boosting solar cell performance.

Purpose of the Study:

• To investigate the optoelectronic properties of pristine and divacancy (DV) blue phosphorene (BlueP) thin films.
• To explore the impact of structural deformation on BlueP thin films with divacancies.

Main Methods:

• First-principles calculations using generalized gradient approximation.
• Application of a microscopic (non-)affine deformation model.
• Analysis of orbital hybridization and electronic structure.

Main Results:

• Divacancies in BlueP introduce dangling bonds with modified orbital hybridization under deformation.
• Deformation creates an effective light trap, enhancing material absorption efficiency.
• Compressive strain in DV BlueP induces a unique sigma + pi plasmon signature.

Conclusions:

• Defect engineering in low-dimensional materials offers a practical approach to tailor optoelectronic properties.
• Divacancy-induced light trapping presents a novel strategy for functionalized solar cell design.
• Bottom-up design of solar cells using selective defects is a promising avenue.