Hot Dipping Post Treatment for Improved Efficiency in Micro Patterned Semitransparent Perovskite Solar Cell
Monika Rai a, Stav Rahmany b, Shlomo Magdassi b, Lioz Etgar b, Lydia Helena Wong a, Swee Sien Lim c
a Nanyang Technological University (NTU), Singapore
b The Hebrew University of Jerusalem, The Institute of Chemistry, Casali Center of Applied Chemistry, Edmond J. Safra Campus Givat Ram, Jerusalem, Israel
c Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University 637371 Singapore
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Thin Film Photovoltaics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Kai Zhu
Oral, Monika Rai, presentation 022
Publication date: 21st November 2018

Perovskite solar cells have emerged as a new semi-transparent PV technology for urban infrastructures that demands an explicit trade-off between power conversion efficiency (PCE) and average visible transparency (AVT) which can be adjusted by various modifications in the absorber layer. Here, we introduce a scalable and facile “one and a half” step deposition route for mixed cation perovskite patterned in a sub-micron sized grid structure for semi-transparent solar cells. The initial perovskite phase is formed in one step using a grid pattern, while the additional step involves dipping of the pre-deposited perovskite grid in a hot solution of Formamidinium Iodide (FAI) in Isopropanol (IPA). Detailed analysis suggests that the additional step increases pore filling, crystal quality, grain size and lowers the content of residual PbI2 along with improved photophysical properties. An average PCE~10%with AVT of 28% is attained with gold contact for the champion semi-transparent solar cell. The proposed deposition route can be generalized for all other types of perovskite based devices to yield better efficiency.

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