Compact Layer Free Perovskite Solar Cells with a High-Mobility Hole-Transporting Layer

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) are a promising photovoltaic technology.
• Efficient hole-transporting layers (HTLs) are crucial for PSC performance.
• Conventional HTLs often face limitations in efficiency and processing.

Purpose of the Study:

• To investigate a novel diketopyrrolopyrrole-based copolymer as a hole-transporting layer (HTL) in compact layer-free perovskite solar cells.
• To enhance the power conversion efficiency (PCE) of CH3NH3PbI3 perovskite solar cells.
• To evaluate the potential of this new HTL for commercial applications.

Main Methods:

• Fabrication of perovskite solar cells using a simple ITO/CH3NH3PbI3/HTL/MoO3/Ag device configuration.
• Employment of a high-mobility diketopyrrolopyrrole-based copolymer as the HTL.
• Characterization of device performance, including short circuit current density (Jsc), open circuit voltage (Voc), and fill factor (FF).

Main Results:

• Achieved a power conversion efficiency (PCE) of 10.80%, a significant increase from the 6.62% achieved with conventional poly-3-hexylthiophene.
• Observed improvements in Jsc, Voc, and FF attributed to the P-HTL.
• Demonstrated higher carrier mobility, more suitable energy level alignment, and reduced interfacial charge recombination with the P-HTL.

Conclusions:

• The diketopyrrolopyrrole-based copolymer (P) serves as an effective HTL in perovskite solar cells.
• The P-HTL enables high device performance due to enhanced charge transport and reduced recombination.
• The low cost, low-temperature processing, and excellent performance of P-HTL present a viable pathway for commercial PSCs.