15.1% Efficiency For Polymer Film Based Perovskite

Toshiba Corporation Claims Highest Power Conversion Efficiency For Large, Polymer-Film Based Perovskite Solar Module; 15.1% Efficiency Was Achieved For 703 cm² Large-Area Perovskite Solar Module
10:42 PM (Beijing Time) - 13. September 2021
Presentation1

Identifying problems with its previous 2-step meniscus coating, Toshiba achieved 15.1% efficiency for polymer-film based perovskite module devised a 1-step process and dealt with the challenges in crystallization with a new coating process. (Source: Toshiba)

Key Takeaways

  • Toshiba has achieved 15.1% efficiency for 703 cm² large-area perovskite solar module
  • It used a newly developed coating method for the perovskite layer as part of a NEDO project
  • The new coating process uses improved ink, film drying processes and production equipment to form a uniform perovskite layer over a large area
  • It will now aim for 20% or more efficiency on an active area of 900 cm² to further cut manufacturing cost of perovskite PV module to around $0.14 per W

Japanese electronics and engineering firm Toshiba Corporation has reported having achieved 15.1% power conversion efficiency for its 703 cm² large-area perovskite solar module calling it the highest for any large, polymer-film based perovskite PV module.

It was able to achieve this efficiency with the help of a newly developed coating method for the perovskite layer which it claims greatly reduces production time and costs.

Toshiba describes that previously it used a 2-step coating process wherein it first applied a layer of Pbl2 (lead iodide) ink to a substrate, and then a layer of MAI (methyammonium iodide, CH3NH3I) ink. This triggered a reaction that formed a MAPbl3 layer. “However, this multi-step approach had a low coating rate and often left unreacted sections in the perovskite layer,” stated the company.

The current efficiency level has been achieved through a 1-step process where it applied MAPbl3 ink directly, but with a new coating method using improved ink, film drying processes and production equipment to form a uniform perovskite layer over a large area. It helped deal with crystallization of MAPbl3 and get a uniform perovskite layer.

“These innovations halve the steps for deposition of the perovskite layer, and raise the coating speed to 6 meters per minute on a 5×5 cm² module, a rate that meets requirements for mass production*3,” explained the technology experts of Toshiba.

The company believes this simplified production process will significantly advance towards commercialization of highly efficient, low-cost, polymer film-based perovskite PV modules. It now aims to increase the efficiency to 20% or more on an active area of 900 cm² ‘the size required for practical application’ which is expected to cut manufacturing cost of perovskite PV module to around $0.14 per W.

It has achieved the new coating technology and perovskite solar modules under the Japanese government’s Development of Technologies to Promote Photovoltaic Power Generation as a Main Power Source project of the New Energy and Industrial Technology Development Organization (NEDO).

Anu Bhambhani

Anu Bhambhani is the Senior News Editor of TaiyangNews

Write, follow the author.
Email

Anu Bhambhani