Photodoping for Perovskite Solar Cells

Artist’s impression of perovskite structures. (Source: Ella Maru Studio / U. Cambridge)

Scientists at the University of Cambridge studying perovskite materials for next-gene­ration solar cells and flexible LEDs have discovered that they can be more efficient when their chemical compositions are less ordered, vastly simplifying produc­tion processes and lowering cost. The surprising findings are the result of a colla­borative project, led by Felix Deschler and Sam Stranks.

The most commonly used material for producing solar panels is crystalline silicon, but to achieve efficient energy conversion requires an expensive and time-consuming production process. The silicon material needs to have a highly ordered wafer structure and is very sensitive to any impurities, such as dust, so has to be made in a cleanroom. In the last decade, perovskite materials have emerged as promising alternatives. The lead salts used to make them are much more abundant and cheaper to produce than crystal­line silicon, and they can be prepared in a liquid ink that is simply printed to produce a film of the material.

The components used to make the perovskite can be changed to give the materials different colours and struc­tural properties, for example, making the films emit different colours or collect sunlight more effi­ciently. You only need a very thin film of this perovskite material to achieve similar efficiencies to the silicon wafers currently used, opening up the possibility of incor­porating them into windows or flexible, ultra-lightweight smartphone screens. “This is the new class of semi­conductors that could actually revo­lutionise all these tech­nologies,” said Sascha Feldmann, a PhD student at Cambridge’s Cavendish Labora­tory. “These materials show very efficient emission when you excite them with energy sources like light or apply a voltage to run an LED. This is really useful but it remained unclear why these materials that we process in our labs so much more crudely than these clean-room, high-purity silicon wafers, are performing so well.”

Scientists had assumed that, like with silicon materials, the more ordered they could make the materials, the more efficient they would be. But Feldmann and Stuart MacPherson were surprised to find the opposite to be true. “The disco­very was a big surprise really,” said Deschler, who is now leading an Emmy-Noether research group at TU Munich. “We do a lot of spectro­scopy to explore the working mechanisms of our materials, and were wondering why these really quite chemically messy films were performing so exceptionally well.” “It was fascinating to see how much light we could get from these materials in a scenario where we’d expect them to be quite dark,” said MacPherson, a PhD student in the Cavendish Labora­tory. “Perhaps we shouldn’t be surprised considering that perov­skites have re-written the rule book on performance in the presence of defects and disorder.”

The researchers discovered that their rough, multi-component alloyed pre­parations were actually improving the efficiency of the materials by creating lots of areas with different compo­sitions that could trap the energised charge carriers, either from sunlight in a solar cell, or an electrical current in an LED. “It is actually because of this crude processing and subsequent de-mixing of the chemical components that you create these valleys and mountains in energy that charges can funnel down and concen­trate in,” said Feldmann. “This makes them easier to extract for your solar cell, and it’s more efficient to produce light from these hotspots in an LED.”

Their findings could have a huge impact on the manu­facturing success of these materials. “Companies looking to make bigger fabri­cation lines for perov­skites have been trying to solve the problem of how to make the films more homogenous, but now we can show them that actually a simple inkjet printing process could do a better job,” said Feldmann. “The beauty of the study really lies in the counter­intuitive discovery that easy to make does not mean the material will be worse, but can actually be better.”

“It is now an exciting challenge to find fabri­cation conditions which create the optimum disorder in the materials to achieve maximum efficiency, while still retaining the structural properties needed for specific appli­cations,” said Deschler. “If we can learn to control the disorder even more precisely, we could expect further LED or solar cell perfor­mance improve­ments – and even push well beyond silicon with tailored tandem solar cells comprising two different colour perovskite layers that together can harvest even more power from the sun than one layer alone,” said Sam Stranks, Uni­versity Lecturer in Energy at the Cambridge Department of Chemical Engi­neering and Bio­technology and the Cavendish Laboratory. Another limi­tation of perovskite materials is their sensitivity to moisture, so the groups are also inves­tigating ways to improve their stability. “There’s still work to do to make them last on rooftops the way silicon can – but I’m opti­mistic,” said Stranks. (Source: Cambridge U.)

Reference: S. Feldmann et al.: Photodoping through local charge carrier accumulation in alloyed hybrid perovskites for highly efficient luminescence, Nat. Phot., online 11 November 2019; DOI: https://doi.org/10.1038/s41566-019-0546-8

Link: Optoelectronics, Cavendish Laboratory, University of Cambridge, Cambridge, UK

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