Efficient inverted bulk heterojunction photovoltaic devices using a transparent polymeric interfacial buffer layer...

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Organic photovoltaic devices require efficient interfacial layers to optimize charge extraction and device performance.
• Traditional buffer layers often involve inorganic materials or complex processing.

Purpose of the Study:

• To synthesize a novel, transparent, polymeric n-type material (M1) for use as an interfacial buffer layer.
• To evaluate the performance of M1 in inverted bulk heterojunction (BHJ) organic photovoltaic devices.

Main Methods:

• Synthesis of a C60 pendant and UV curable polymer (M1).
• Fabrication of inverted BHJ photovoltaic devices using M1 as an n-type interfacial buffer layer.
• Device characterization under simulated solar illumination (AM 1.5G, 100 mW/cm2).

Main Results:

• The highest efficient devices achieved a power conversion efficiency (PCE) of 2.16%.
• Key performance metrics included short-circuit current (Jsc) of 6.70 mA/cm2, fill factor (FF) of 54.2%, and open-circuit voltage (Voc) of 0.60 V.
• Performance was comparable to devices using cesium carbonate (Cs2CO3) as a buffer layer.

Conclusions:

• The synthesized M1 is a promising, transparent, polymeric n-type interfacial buffer layer.
• M1 offers a viable alternative for enhancing the efficiency of BHJ photovoltaic devices.
• This development contributes to the advancement of organic solar cell technology.