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Vapour Deposited Perovskite Solar Cell Research enabled by Kurt J. Lesker

Perovskite structure based materials set to revolutionise photovoltaics

330nm thick perovskite device

Solar cells work by using materials that absorb photons from sunlight in a broad spectral range and in turn effectively convert this captured light into free charges that produce electricity. Modern solar cells are based on crystalline Silicon (c-Si) which is a cheap and abundant semiconductor, however the cost to produce electricity using them is relatively high as the efficiency rates of c-Si based cells are relatively low. As a result thin film solar cells have been developed to combat crystalline Silicon’s inherent inefficiencies. Technologies such as CIGS, CdTE, amorphous Silicon and OPV have all strived to create solar cells that have high efficiencies coupled with good cell stability and low manufacturing costs.

However there is a new type of material that has the potential to revolutionise the field of photovoltaics: perovskite structure based materials. A perovskite structure is any material with the formula ABX3 and it is the recent work centred on organometal halide perovskites that has recently generated a feel good factor in the solar energy world and Kurt J Lesker has been at the centre of the key research in driving this exciting technology forward.

Perovskite Solar Cell Efficiencies vs. Existing Technologies
Perovskite Solar Cell
Efficiencies vs. Existing Technologies

The ideal solar cell should have high carrier mobility necessary for charge extraction coupled with a wide spectral absorption range. In the past it is has been difficult to get both facets using existing materials, however perovskite structures have been found to strike a workable balance between the two requirements. Furthermore, breakthrough research led by Professor Henry Snaith(a) in the Department of Physics at the University of Oxford, UK using a Kurt J Lesker Mini-SPECTROS™ has shown that vapour deposited perovskites can be produced with a higher level of crystallinity versus solution processed methods so that perovskites solar cells can now compete effectively with existing thin film cell technologies (see graph below). It is this major step in the evolution of perovskite solar cells that was reported in the esteemed journal Nature (Click here for article).

Professor Henry Snaith
(a) Henry Snaith
Kurt J. Lesker staff at Oxford University lab
(b) Kurt J. Lesker staff at Oxford University lab
330nm thick perovskite device
(c) Record breaking 330nm thick perovskite device which exhibited an efficiency of 15.4%

The Mini-SPECTROS is a versatile glovebox-interfaced perovskite vapour deposition system that uses proprietary Kurt J Lesker eKLipse™ software to accurately control Kurt J Lesker low temperature evaporation (LTE) sources. These sources are ideal for the deposition of perovskite materials. The Mini-SPECTROS provides the researcher with very precise evaporation/deposition rate control and an accurate material doping level in co-deposition mode which results in very high film uniformity and homogeneity that is important for perovskite device manufacture. Kurt J Lesker also offers gloveboxes to integrate to the Mini-SPECTROS along with glovebox accessories such as spin-coaters, hot-plates and solar-simulators.

Henry Snaith’s group collaborated with the research group run by Professor Michael Johnston at Oxford, here shown pictured with Kurt J Lesker staff in photo(b) and Mingzhen Liu (Snaith’s and Johnson’s joint student) looked at the thin film structure of [TiO2/CH3NH3PbI3/OmeTAD] and used the Kurt J Lesker Mini-SPECTROS system to co-deposit the precursor salts of CH3NH3I and PbCl2 from two LTE sources (see set-up below) to deposit the perovskite layer of CH3NH3PbI3-xClx and create a record breaking 330nm thick perovskite device(c) which exhibited an efficiency of 15.4%. This figure places vacuum deposited perovskite well and truly amongst existing solar cell technologies. Henry Snaith predicts that in the next 5 years efficiency figures of >20% will be possible with perovskites.

Mini SPECTROS with 2 port adapter & standard 2 port SG glovebox
Kurt J Lesker Mini-SPECTROS Perovskite Vapour Deposition System with 2 port adapter & standard 2 port SG glovebox
KJL Mini-SPECTROS Perovskite Co-deposition Chamber Layout
Kurt J Lesker Mini-SPECTROS Perovskite Co-deposition Chamber Layout

Speaking of the Mini-SPECTROS and working with Kurt J Lesker, Henry Snaith commented:

“The Mini-SPECTROS has proven to be the ideal tool for rapidly proving out the feasibility of vapour deposited perovskite solar cells, the combination of organic and metal sources offers great versatility for investigating new materials with a broad range of deposition temperatures. The prompt and friendly service offered by Lesker has also helped us to get the most out of this tool.” — Professor Henry Snaith, University of Oxford

The benefits of vapour deposited perovskites using the Mini-SPECTROS are touched on in the Nature paper;

“Dual-source vapour deposition results in superior uniformity of the coated perovskite films over a range of length scales, which subsequently results in substantially improved solar cell performance.”

“A distinct advantage of vapour deposition over solution processing is the ability to prepare layered multi-stack thin films over large areas.”

To find out more about Thin Film Deposition systems, please contact
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3 Comments on Vapour Deposited Perovskite Solar Cell Research enabled by Kurt J. Lesker

  1. Do you have a spam issue on this site; I also am a
    blogger, and I was wondering your situation; many of us have developed some nice methods and we are looking
    to exchange techniques with other folks, please shoot me an e-mail if interested.

  2. I never know how the spectros system worked. great read.

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