Identifying and suppressing interfacial recombination to achieve high open-circuit voltage in perovskite solar cells

With close to 100% internal quantum efficiency over the absorption spectrum, photocurrents in perovskite solar cells (PSCs) are at their practical limits. It is therefore imperative to improve open-circuit voltages ( V OC ) in order to go beyond the current 100 mV loss-in-potential. Identifying and...

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Veröffentlicht in:Energy & environmental science 2017, Vol.1 (5), p.127-1212
Hauptverfasser: Correa-Baena, Juan-Pablo, Tress, Wolfgang, Domanski, Konrad, Anaraki, Elham Halvani, Turren-Cruz, Silver-Hamill, Roose, Bart, Boix, Pablo P, Grätzel, Michael, Saliba, Michael, Abate, Antonio, Hagfeldt, Anders
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Sprache:eng
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Zusammenfassung:With close to 100% internal quantum efficiency over the absorption spectrum, photocurrents in perovskite solar cells (PSCs) are at their practical limits. It is therefore imperative to improve open-circuit voltages ( V OC ) in order to go beyond the current 100 mV loss-in-potential. Identifying and suppressing recombination bottlenecks in the device stack will ultimately drive the voltages up. In this work, we investigate in depth the recombination at the different interfaces in a PSC, including the charge selective contacts and the effect of grain boundaries. We find that the density of grain boundaries and the use of tunneling layers in a highly efficient PSC do not modify the recombination dynamics at 1 sun illumination. Instead, the recombination is strongly dominated by the dopants in the hole transporting material (HTM), spiro-OMeTAD and PTAA. The reduction of doping concentrations for spiro-OMeTAD yielded V OC 's as high as 1.23 V in contrast to PTAA, which systematically showed slightly lower voltages. This work shows that a further suppression of non-radiative recombination is possible for an all-low-temperature PSC, to yield a very low loss-in-potential similar to GaAs, and thus paving the way towards higher than 22% efficiencies. Dopants in the hole transport layer limit the open-circuit voltage of perovskite solar cells.
ISSN:1754-5692
1754-5706
DOI:10.1039/c7ee00421d