Multifunctional Narrow Band Gap Terpolymer-Enabled High-Performance Dopant-Free Perovskite and Additive-Free Organic...

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Developing multifunctional, low-cost materials for optoelectronic devices remains a significant challenge.
• Ternary copolymers offer a promising route to achieve desired material properties for advanced applications.

Purpose of the Study:

• To design and synthesize novel terpolymers with a specific A1-π-D-π-A2 backbone for enhanced optoelectronic device performance.
• To evaluate the potential of these terpolymers as dopant-free hole-transporting materials in perovskite solar cells (PSCs) and as components in organic solar cells (OSCs).

Main Methods:

• Random ternary copolymerization was employed to synthesize two terpolymers: TP-0.8-EG and TP-0.8-TEG.
• The synthesized terpolymers were characterized for their optoelectronic properties, including energy levels, charge mobility, and film-forming capabilities.
• Device fabrication and performance testing were conducted for both dopant-free PSCs and ternary OSCs using the developed terpolymers.

Main Results:

• TP-0.8-EG exhibited superior performance compared to TP-0.8-TEG and BT-UF in dopant-free PSCs, achieving a power conversion efficiency (PCE) of 20.9%.
• In ternary OSCs, TP-0.8-EG demonstrated a high PCE of 16.52% when paired with PM6:Y7.
• Both PSC and OSC devices incorporating TP-0.8-EG showed excellent storage stability (retaining 85% and 83% of initial PCE after 1200 and 500 hours, respectively) and good thermal/moisture resistance.

Conclusions:

• The A1-π-D-π-A2 terpolymer, TP-0.8-EG, is a highly effective dopant-free hole-transporting material for PSCs and a valuable component for OSCs.
• The developed terpolymer offers a rare combination of high efficiency and good device stability in both types of solar cells.
• This research presents a promising strategy for designing advanced materials for next-generation optoelectronic devices.