Material Amelioration of Organometal Halide Perovskite by Potassium-doping and Its Efficient Photovoltaics
Takeru Bessho a
a Research Center for Advanced Science and Technology, The University of Tokyo, Japan
Invited Speaker Session, Takeru Bessho, presentation 058
Publication date: 14th October 2019

The Organometal halide perovskite solar cells (PSCs) have been dramatically researched and developed in the power conversion efficiency (PCE) certified over 24% [1] which is comparable to other solid state solar cells as crystalline silicon, CIGS, CdTe, etc. The modification of the components of perovskite is one of the key word for the refinement of quality and morphology of crystal and layer with increasing the abundance of photoactive phase such as tetragonal, cubic, trigonal, and decreasing the surface roughness and void in the layer, especially, with A-site cation in perovskite structure ABX3 [2]. In this talk, we report the potassium cation doping effect to perovskite absorber about properties of the expanded crystal lattice constant, red-shifted light absorption, up shifted conduction and valance band position, disappeared grain boundary in film, diminished hysteresis in photovoltaic I-V curve with over 20% PCE [3,4], furthermore, we have reached new composition as MA-Free system with over 21% PCE. The scaling up the photo active area with small less of FF without drop of Voc from single cells was maintained by development of device fabrication process point of view. Recently, the PCE was reached near 21% by 1 cm2 and 2.76 cm2 with less hysteresis based on the better flatness and less impurity of perovskite film by optimizing the process.



[1] Martin A. Green, et al.  Prog Photovolt Res Appl. 27, 565–575 (2019).

[2] Saliba, M., Grätzel, M., et al.  Science, 354, 206–209 (2016).

[3] Z. Tang, T. Bessho, H. Segawa, et al.  Sci. Rep., 7, 12183 (2017).

[4] Z. Tang, S. Uchida, T. Bessho, H. Segawa et al.  Nano Energy, 45, 184–192, (2018).

The authors thank the New Energy and Industrial Technology Development Organization (NEDO, Japan) for their financial supports.

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