Takayuki Negami a, Hiroshi Higuchi a, Takashi Nishihara a, Ryusuke Uchida a, Teruaki Yamamoto a, Taisuke Matsui a, Yukihiro Kaneko a
a Panasonic Corporation, 1006 Kadoma, Kadoma, Osaka 571-8501, Japan
Oral, Takayuki Negami, presentation 047
Publication date: 14th October 2019

Perovskite solar cells have achieved a high efficiency over 25% in spite of solution based processes. The production cost of perovskite PV modules is expected to drastically decrease by the solution based processes with a low temperature annealing under atmospheric. In order to produce large area modules with a high efficiency and low cost, it is necessary to prepare highly uniform perovskite films with a high printing speed. We have selected an ink jet printing method from several large area coating methods because ink droplets controlled accurately from a lot of nozzles can form highly uniform thickness of films with a high-speed printing. We have investigated the uniformity of the cell performance in-plane. Precursors of the perovskite films were prepared by coating the solution containing CsI, MAI, FAI and PbI2 using the ink jet printing on 17 substrates of a structure of glass/TCO/c-TiO2/mp-TiO2 with a 2.5 x 2.5 cm2 size located randomly on a 30 x 30 cm2 area. The ink jet printing method can coat the films only on each substrate by drawing patterns. Toluene as an anti-solvent was quickly dropped onto each precursor during the substrate spun. The films were then dried to form the perovskite layers. PTAA films as a HTM prepared by spin coating on the perovskite films. Au films as a back electrode were deposited by vacuum evaporation. 66 cells with an aperture area of 0.1cm2 on 17 substrates showed an average efficiency of 19.4% with a distribution of plus minus 1.7%. High efficiencies and high uniformity in plane of 30 x 30 cm2 area have achieved by the ink jet printing. These results show that the ink jet printing is suitable to produce the large area perovskite modules with a high efficiency. We have also fabricated 30 x 30 cm2 sized modules by the ink jet printing. The performance of the modules will be described in detail at the conference.

This presentation is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

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