Solid or Liquid? By Dr Damion Milliken, CTO, and Dr Hans Desilvestro, Chief Scientist - July 2013
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1 Solid or Liquid? By Dr Damion Milliken, CTO, and Dr Hans Desilvestro, Chief Scientist - July 2013 Introduction Natural photosynthesis, based on complex organic photoactive antennae and metal organic redox and other catalysts, evolved not long after the origin of life and became, apart from geothermal heat for certain bacteria, the exclusive source of energy for all forms of life over several billion years, at least until humankind learnt to tap other natural energy sources such as wind, flowing water and nuclear energy. Technically, artificial photosynthetic processes were exploited for the first time in 1837 by Daguerre in his pioneering early trials with photography. The same photochemical and photophysical principles, which governed traditional photography and involved organic sensitisers, inorganic semiconductors and redox reactions and result in very effective charge separation following excitation by light, laid the cornerstones for dye solar cells (DSCs) with their unique properties. One great advantage of DSC is that it remains efficient even when panel orientation in regards to the North-South direction and/or the angle from horizontal is far from optimum e.g. on building façades, where more traditional PV panels such as crystalline silicon significantly lose efficiency due to increased electron-hole recombination at lower light levels. DSC devices, in contrast, work especially well under light levels corresponding to around 30% - 50% full sun, such as typically available on the side of a building during the course of an average day. Even with AM1.5 G (see info box to right) DSC efficiencies being lower compared to crystalline silicon, the DSC levelised cost of electricity is comparable or even lower than for traditional PV panels offering higher peak efficiencies - especially on façades in areas with relatively high levels of diffuse radiation. When DSC has a lower levelised cost of energy than PV panels this means that your DSC greenalternative steel roofing or DSC green-alternative window will produce energy for you at a lower cost than the traditional tack-on PV panel. Levelised Cost of Energy (LCOE) is a calculation that gives the cost of electricity (typically in cents per kilowatt hour) generated by different sources of power. LCOE calculations take in all factors that influence the cost of energy production including the initial capital including the inverter and cabling, manufacturing and installation costs, discount rate, the cost of continuous operation, fuel, and maintenance. LCOE helps us compare apples to apples when discussion different sources of power. In addition, the unique attribute of DSC in the built environment is its ability to capture and convert light into electricity while maintaining a level of transparency unattainable for other PV technologies. DSC devices, glassbased DSC products in particular, can be produced in a wide range of colours and transparency options and can become an integral aesthetic part of a building in the form of specially designed cladding or semi-transparent windows. The standard small cell liquid DSC material set combination with TiO 2 and I 3 - /I - produces an efficiency of around 12%. Cobalt complexes offer higher device voltages, but their much larger size results in slower ionic diffusion, which significantly limits performance under higher illumination levels, particularly in electrolytes which use stable industrially feasible solvents. DSC based on Cobalt complexes or other larger size redox systems are thus best suited for indoor applications, where cell efficiencies under indoor fluorescent room lighting can reach an incredible 26%, while standard silicon cells provide only 9%. Dyesol Ltd: Global Leaders in Dye Solar Cell Technology Page 1 of 5
2 Solid-State DSC with Inorganic Sensitisers Game Changing PV Technology True solid-state DSC (ssdsc) has been of enormous industrial interest for a long time. After the first report featuring a ssdsc in 1998 by EPFL with 0.74% efficiency, progress was relatively slow. Scientists had to learn that ssdsc has special requirements in terms of processing, pore filling with a solid, in particular, optimum TiO 2 thickness (the thinner the better) and dyes with high enough absorption coefficients, which were compatible with thinner TiO 2 layers. Suppressing interfacial recombination was another challenge as well as creating sufficient hole conductivity, e.g. through doping of the hole transport material. The highest efficiency so far for dye-based ssdsc had been 7.2% and was reported in Then, almost out of the blue, appeared solid state dye solar cells featuring inorganic materials of perovskite stoichiometry ABX 3, i.e. compounds which crystallise in the same structure as the natural mineral Perovskite (=CaTiO 3 ). In contrast to oxides (X=O), with many different ABX 3 perovskite type composition found in natural deposits, perovskites for photovoltaic applications are based on halides (i.e. X=I, Br or Cl), tin or lead (i.e. B=Sn or Pb) and feature a relatively large cation (e.g. A + =Cs + or an organic cation, such as an ammonium cation). Compared to standard molecular dyes, perovskites can suppress the electron back transfer (recombination) between the excited electron and the holes in the hole transport material by a factor of around 10 million! These favourable interfacial electron transfer kinetics enabled, over the past year, incredibly fast improvement of ssdsc device performance with virtually bi-weekly announcements of progress, see the figure below. No other PV technology has ever before undergone such rapid progress. Historic development of small laboratory ssdsc (green) and liquid-based DSC performance (orange). Dyesol Ltd: Global Leaders in Dye Solar Cell Technology Page 2 of 5
3 ssdsc offers a series of advantages: 1) No liquid component in device, which renders manufacture of large area, thin film devices much easier and holds the promise of longer product life, especially in hot climates. 2) In principle, much less driving force is required for dye (or sensitiser) regeneration in ssdsc compared to the commonly used I 3 - /I - system of liquid DSC where DSC energy losses are ev due to a complex two-electron transfer process, requiring considerable activation energy. Thus, significantly higher voltages are possible with ssdsc compared to traditional DSC. 3) Certain inorganic sensitisers e.g. in the form of quantum dots or very thin layers, are soluble in traditional DSC electrolyte systems, which renders them, therefore, incompatible with liquid electrolytes. Certain inorganic sensitisers are very strong light absorbers and offer better coverage of the solar spectrum, resulting in higher device currents and thus power output. 4) Only electronic charge i.e. electrons and holes, is transported in ssdsc, rather than ions in addition to electrons as in traditional DSC. Thus, charge transport is not limited by the size of ionic or molecular redox species. 5) ssdsc, based on highly absorbing inorganic materials, enables thinner and thinner devices, which require less and less material and holds the promise of lower materials costs. In combination with higher expected device voltages (2.), currents (3.) and possibly fill factors (4.), ultimately higher device efficiency and lower LCOE (levelised cost of electricity) is expected. ssdsc, therefore, seems to combine the best of two worlds. The inherent advantages of DSC i.e. effective charge separation into two phases thanks to fast injection of electrons into a wide bandgap semiconductor and fast charge neutralisation by a semiconductive donor, superior harvesting of diffuse light, an option of partial transparency, and colour selection are maintained, while cumbersome and challenging filling of devices with a liquid can be avoided. Dyesol Ltd: Global Leaders in Dye Solar Cell Technology Page 3 of 5
4 Which Family? With the more recent developments, boundaries between DSC and more traditional p-n heterojunctions become more and more blurred. Presently there are three main solid-state DSC embodiments under examination, see the figure below 4(A-C) in addition to a p-n heterojunction (D). Schematics of the main solid-state mesoscopic solar cell embodiments. In all cases, light enters the device from the top. A) FTO/wide band gap semiconductor/dye/htm/metal contact This system has been under development for the longest time. Spiro-MeOTAD is the most commonly used hole transport material (HTM) with the highest performance achieved to date. Alternative HTMs, such as CuI, CuSCN and conductive polymers e.g. polythiothenes or polyanilines, tend to offer lower performance than spiro. B) FTO/wide band gap semiconductor/dye/perovskite HTM+light absorber/metal contact These cells are based on TiO 2 /N719/doped CsSnI 3 (perovskite)/nano-pt catalyst/fto. A drawback of CsSnI 3 is its significant sensitivity to air, necessitating manufacturing under strict atmospheric control, which could be rather costly and would require stringently hermetic seals. C) FTO/wide band gap semiconductor/perovskite sensitiser/htm/metal contact It is with this system that very rapid ssdsc progress has occurred. Within 9 months, efficiencies of laboratory cells increased from 9.7 to 15%, which is up from around 5% in Dyesol actively participates in development of these sensitised mesoscopic solar cells. Inorganic sensitisers tend to offer a steeper onset of the optical absorption at longer wavelengths. D) FTO/perovskite/HTM/metal contact These devices do not utilise a nanoporous TiO 2 film, which may contribute to lowered product cost. The high vacuum deposition technique employed for the perovskite layer would however offset any such cost savings. Such heterojunctions have the disadvantage that charge separation following exciton formation is not facilitated through a mesoporous n-type semiconductor scaffold such as TiO 2. Dyesol Ltd: Global Leaders in Dye Solar Cell Technology Page 4 of 5
5 In summary, systems C) and D) are being evaluated and reviewed in depth, with initial indication that they are potentially the most appropriate solid state material sets for the commercial applications Dyesol seeks to exploit. Summary and Outlook Since mid-2012, the pace of progress with ssdsc has been astounding and some of the novel material combinations and device architectures have allowed the solid state DSC variations to catch up with and, most recently, to surpass performance of traditional solvent and redox-couple based DSC. These avenues are extremely promising to push DSC-type device technology to the next level of performance and to lower manufacturing costs, all while avoiding liquid electrolytes, offering good low light energy generating capability and even retaining the option of partial transparency. In contrast to standard DSC, where the most efficient and stable dyes are red, inorganic materials can more easily be tuned to a variety of colours including grey, similar to standard tinted windows. Further R&D work and, in particular industrial scale-up and process development work on this new variation in the technology, is required and ongoing. Device stability at the cell level under light and at elevated temperatures such as 85 o C must be completed to match the durability levels of the liquid DSC systems. Laboratory processes such as spin coating or physical vapour deposition for the technology will be replaced by industrially scalable and lower cost processes. The following table summarises the main differences between solid-state and liquid based DSC. *) Depending on materials, possibly slightly higher compared to liquid DSC Significant ssdsc work is presently in progress at Dyesol, partly in collaboration with EPFL within an FP-7 program and in addition Dyesol is working in collaboration with Nanyang Technological University (NTU) on ssdsc as announced earlier in the year. In summary, the ssdsc and related mesoscopic solar cell variants are expected, thanks to recent exciting developments, to have a great future, in particular, in the building integrated photovoltaics applications Dyesol seeks to exploit. - See more at: Dyesol Limited ABN: Dominion Place Queanbeyan, NSW 2620 Australia PO Box 6212, Queanbeyan, NSW 2620 Australia Tel: Fax: information@dyesol.com Dyesol Ltd: Global Leaders in Dye Solar Cell Technology Page 5 of 5
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