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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

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Published on: November 5, 2014

High-performance polymer solar cells with solution-processed and environmentally friendly CuOx anode buffer layer.

Qi Xu¹, Fuzhi Wang, Zhan'ao Tan

¹State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University , Beijing 102206, China.

ACS Applied Materials & Interfaces

|October 8, 2013

Summary

Environmentally friendly copper(II) oxide (CuOx) serves as an effective hole extraction buffer layer in polymer solar cells (PSCs). This simple method significantly boosts power conversion efficiency (PCE) and device performance.

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Area of Science:

Materials Science
Organic Electronics
Renewable Energy

Background:

Polymer solar cells (PSCs) are a promising renewable energy technology.
Efficient hole extraction is crucial for optimizing PSC performance.
Existing buffer layers often involve complex or environmentally unfavorable materials.

Purpose of the Study:

To investigate the use of environmentally friendly copper(II) oxide (CuOx) as a hole extraction anode buffer layer in PSCs.
To evaluate the impact of the CuOx buffer layer on device performance metrics, including open-circuit voltage (Voc), short-circuit current density (Jsc), and power conversion efficiency (PCE).
To analyze the effect of the CuOx interfacial layer on the overall device resistance.

Main Methods:

Preparation of the CuOx buffer layer via spin-coating a copper acetylacetonate solution in 1,2-dichlorobenzene onto an ITO substrate.
Thermal transformation of the coated layer at 80 °C in air to form CuOx.
Fabrication and characterization of PSCs with and without the CuOx buffer layer, using different donor and acceptor materials (P3HT:PCBM, P3HT:ICBA, PBDTTT-C:PCBM).

Main Results:

Introduction of the CuOx buffer layer significantly improved Voc and Jsc in PSCs.
The CuOx layer effectively reduced the overall device resistance.
Power conversion efficiency (PCE) increased from 2.8% to 4.1% for P3HT:PCBM devices, to 6.72% for P3HT:ICBA devices, and reached 7.14% for devices using PBDTTT-C as the donor material.

Conclusions:

Environmentally friendly CuOx is a highly effective material for hole extraction in PSCs.
The simple fabrication method and performance enhancements demonstrate the potential of CuOx for highly efficient PSCs.
CuOx offers a promising alternative for improving PSC performance and stability.