Benefit of Grain Boundaries in Organic-Inorganic Halide Planar Perovskite Solar Cells.
The past 2 years have seen the uniquely rapid emergence of a new class of solar cell based on mixed organic-inorganic halide perovskite. Grain boundaries are present in polycrystalline thin film solar cell, and they play an important role that could be benign or detrimental to solar-cell performance. Here we present efficient charge separation and collection at the grain boundaries measured by KPFM and c-AFM in CH3NH3PbI3 film in a CH3NH3PbI3/TiO2/FTO/glass heterojunction structure. We observe the presence of a potential barrier along the grain boundaries under dark conditions and higher photovoltage along the grain boundaries compare to grain interior under the illumination. Also, c-AFM measurement presents higher short-circuit current collection near grain boundaries, confirming the beneficial roles grain boundaries play in collecting carriers efficiently.
†Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia.
Jae S
JS
Yun
†Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia.
Anita
A
Ho-Baillie
†Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia.
Shujuan
S
Huang
†Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia.
Sang H
SH
Woo
‡School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia.
Yooun
Y
Heo
‡School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia.
Jan
J
Seidel
§Department of Materials Engineering, Monash University, Victoria 3800, Australia.
Fuzhi
F
Huang
§Department of Materials Engineering, Monash University, Victoria 3800, Australia.
Yi-Bing
YB
Cheng
†Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia.
Martin A
MA
Green
grain boundaries; heterojunction solar cell; local current mapping; perovskite; scanning probe microscopy