MSE 2016 - Full Program

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Lecture

Influence of GITC (guanidinium thiocyanate) on the performance of MAPbI3 perovskite solar cells by two step solution processing

Tuesday (27.09.2016)
11:30 - 11:45
Part of:


Perovskite solar cells have emerged one of the promising next generation power source. Perovskite solar cells achieved power conversion efficiency beyond 20 % within 7 years since its discovery. The new perovskite materials with an ABX3-crystal structure are commonly based on an organic cation as A, lead as B and halides as X compound. The most common perovskite solar cell structure is FTO/TiO2/mp-TiO2+CH3NH3PbI3/spiro-OMeTAD/Au. The poor coverage and the presence of hysteresis in the voltage-dependent photocurrent are the main issues of this type of perovskite solar cells. Here, we demonstrate high-performance perovskite solar cell by introducing small amounts of GITC as an A compound to control the morphology in perovskite precursor solution. The incorporated guanidinium cation which has three NH2 groups results in a symmetrical structure and therefore has zero dipole moment. As a result, the power conversion efficiency of 12.7% (pristine perovskite solar cell: 10.6 %), highly homogeneous film morphology, and no hysteresis effect are achieved. This study represents that guanidinium thiocyanate helps the formation of smooth film and reducing the hysteresis of the voltage-current curve, therefore, provide efficient way to fabricate a high efficiency perovskite solar cells.

Speaker:
Senol Öz
University of Cologne
Additional Authors:
  • Eunhwan Jung
    University of Cologne
  • Senol Oez
    University of Cologne
  • Ripon Bhattacharjee
    Queensland University of Technology
  • Prof. Dr. Hongxia Wang
    Queensland University of Technology
  • Prof. Dr. Sanjay Mathur
    University of Cologne