Normal and inverted hysteresis in perovskite solar cells

Nemnes, George Alexandru and Besleaga, Cristina and Stancu, Viorica and Dogaru, Daniela Emilia and Leonat, Lucia Nicoleta and Pintilie, Lucian and Torfason, Kristinn and Ilkov, Marjan and Manolescu, Andrei and Pintilie, Ioana Normal and inverted hysteresis in perovskite solar cells. The Journal of Physical Chemistry Letters. (Submitted)


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Hysteretic effects are investigated in perovskite solar cells in the standard FTO/TiO2/CH3NH3PbI(3-x)Cl(x)/spiro OMeTAD/Au configuration. We report normal(NH)and inverted hysteresis(IH) in the J-V characteristics occurring for the same device structure, the behavior strictly depending on the pre-poling bias. NH typically appears at pre-poling biases larger than the open circuit bias, while pronounced IH occurs for negative bias pre-poling. The transition from NH to IH is marked by a intermediate mixed hysteresis behavior characterized by a crossing point in the J-V characteristics. The measured J-V characteristics are explained quantitatively by the dynamic electrical model (DEM). Furthermore, the influence of the bias scan rate on the NH/IH hysteresis is discussed based on the time evolution of the non-linear polarization. Introducing a three step measurement protocol, which includes stabilization, pre-poling and measurement, we put forward the difficulties and possible solutions for a correct PCE evaluation.

Item Type: Article
Subjects: Physical Chemistry
Depositing User: Professor Andrei Manolescu
Date Deposited: 02 Apr 2017 18:02
Last Modified: 02 Apr 2017 18:02

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