Yissum - Research Development Company of the Hebrew University

Semi-Transparent Perovskite Solar Cells

Posted by Yissum - Research Development Company of the Hebrew UniversityResponsive · Innovative Products and Technologies · Israel

Summary of the technology

Transparent films which generate energy for incorporation into windows.
Keywords: solar cells, windows, clean tech, green, BIPV, building incorporated PV, energy,
The associated patent relates to architecture of cells.
Project ID : 15-2014-3075

Yissum - Research Development Company of the Hebrew University

Description of the technology


  • Organic and inorganic materials are being widely used for development of semi-transparent solar cells that may be integrated in office buildings and replacement windows to enable harvesting of low-cost solar energy over wide surfaces.
  • Perovskite-based solar cells combine simple, low-cost deposition methods with high power conversion efficiencies (PCEs), making them exciting new candidates for low-cost solar energy.
  • Currently there has been no simple method to enable the production of hole-conductor-free perovskite solar cells which avoids the use of expensive organic/polymeric hole-transporting materials (HTM).
  • There is need for a low-cost method is that enables precise control the transparency of the cell and high power conversion efficiencies (PCEs) in order to maximize overall solar cell efficiency.

Our Innovation

Simple deposition method for the fabrication of semi-transparent, hole-conductor-free perovskite-based solar cells.

(A) The PCE of the semi-transparent HTM free cells vs. their average transparency calculated in the range of 400–800 nm wavelengths.

(B) The average transparency of the perovskite solar cells vs. the concentration (%wt) of the assembly solution of the precursors.

(C) Images of the semi-transparent HTM free cells with different average transparencies from left to right,19%, 28%, 38%, 64% and 67%.

(D) The current-voltage curves of the semi-transparent HTM free cells with different average transparencies. The PCEs of the cells are 0.41%, 1.02% and 2.39% for the cells of 39%, 25% and 12% transparency, respectively.

Key Features

  • Avoiding the use of a hole conductor has an advantage for transparency since hole transport materials absorb in the visible range resulting in decreased transparency.
  • All layers of the cell are deposited in an ambient environment using simple, low cost self-assembly or spin coating deposition methods (followed by different annealing processes).
  • The semi-transparent cells demonstrate 20%–70% transparency.


Solar cell efficiencies of devices using perovskite absorber materials have increased from 3.8% in 2009 [1] to a certified 20.1% in 2014, making this the fastest-advancing solar technology to date. Their high efficiencies and cheap production costs make perovskite solar cells an extremely commercially attractive option, with start-up companies already promising modules on the market by 2017. [2][3]

  • 1. Kojima, Akihiro; Teshima, Kenjiro; Shirai, Yasuo; Miyasaka, Tsutomu (6 May 2009). "Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells". Journal of the American Chemical Society 131 (17): 6050–6051. doi:10.1021/ja809598r. PMID 19366264.
  • 2. Oxford Photovoltaics oxfordpv.com Oxford PV reveals breakthrough in efficiency of new class of solar cell, 10 June 2013
  • 3. "The Wall Street Journal: Perovskite Offers Shot at Cheaper Solar Energy" (September 28, 2014)".

Researcher Information


Project manager

Matt Zarek

Project researchers

Shlomo Magdassi
HUJI, Faculty of Science
The Institute of Chemistry

Lioz Etgar
HUJI, Faculty of Science
The Institute of Chemistry

Related keywords

  • Environment
  • Waste Management
  • Clean Production / Green Technologies
  • Pollution and Recycling Related
  • Chemistry & Materials
  • Coatings

About Yissum - Research Development Company of the Hebrew University

Technology Transfer Office from Israel

Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. Founded in 1964 to protect and commercialize the Hebrew University’s intellectual property. Ranked among the top technology transfer companies, Yissum has registered over 8,900 patents covering 2,500 inventions; has licensed out 800 technologies and has spun-off 90 companies. Products that are based on Hebrew University technologies and were commercialized by Yissum generate today over $2 Billion in annual sales.

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