Carrier Separation and Transport in Perovskite Solar Cells Studied by Nanometre-Scale Profiling of Electrical Potential: Article No. 8397

Chun-Sheng Jiang, Mengjin Yang, Yuanyuan Zhou, Bobby To, Sanjini Nanayakkara, Joseph Luther, Weilie Zhou, Joseph Berry, Jao van de Lagemaat, Nitin Padture, Kai Zhu, Mowafak Al-Jassim

Research output: Contribution to journalArticlepeer-review

210 Scopus Citations

Abstract

Organometal-halide perovskite solar cells have greatly improved in just a few years to a power conversion efficiency exceeding 20%. This technology shows unprecedented promise for terawatt-scale deployment of solar energy because of its low-cost, solution-based processing and earth-abundant materials. We have studied charge separation and transport in perovskite solar cells - which are the fundamental mechanisms of device operation and critical factors for power output - by determining the junction structure across the device using the nanoelectrical characterization technique of Kelvin probe force microscopy. The distribution of electrical potential across both planar and porous devices demonstrates p-n junction structure at the TiO2/perovskite interfaces and minority-carrier diffusion/drift operation of the devices, rather than the operation mechanism of either an excitonic cell or a p-i-n structure. Combining the potential profiling results with solar cell performance parameters measured on optimized and thickened devices, we find that carrier mobility is a main factor that needs to be improved for further gains in efficiency of the perovskite solar cells.
Original languageAmerican English
Number of pages10
JournalNature Communications
Volume6
DOIs
StatePublished - 2015

NREL Publication Number

  • NREL/JA-5K00-64457

Keywords

  • charge separation
  • Kelvin probe force microscopy (KPFM)
  • perovskite solar cells
  • solar-photochemistry
  • transport

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