Highly Efficient Perovskite Solar Modules by Scalable Fabrication and Interconnection Optimization

• Published in: ACS energy letters Vol. 3; no. 2; pp. 322 - 328
• Main Authors: Yang, Mengjin, Kim, Dong Hoe, Klein, Talysa R, Li, Zhen, Reese, Matthew O, Tremolet de Villers, Bertrand J, Berry, Joseph J, van Hest, Maikel F. A. M, Zhu, Kai
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 09-02-2018; American Chemical Society (ACS)
• Subjects: deposition; fabrication; MATERIALS SCIENCE; module fabrication; perovskite solar cells; SOLAR ENERGY
• ISSN: 2380-8195; 2380-8195
• DOI: 10.1021/acsenergylett.7b01221

To push perovskite solar cell (PSC) technology toward practical applications, large-area perovskite solar modules with multiple subcells need to be developed by fully scalable deposition approaches. Here, we demonstrate a deposition scheme for perovskite module fabrication with spray coating of a TiO2 electron transport layer (ETL) and blade coating of both a perovskite absorber layer and a spiro-OMeTAD-based hole transport layer (HTL). The TiO2 ETL remaining in the interconnection between subcells significantly affects the module performance. Reducing the TiO2 thickness changes the interconnection contact from a Schottky diode to ohmic behavior. Owing to interconnection resistance reduction, the perovskite modules with a 10 nm TiO2 layer show enhanced performance mainly associated with an improved fill factor. Finally, we demonstrate a four-cell MA0.7FA0.3PbI3 perovskite module with a stabilized power conversion efficiency (PCE) of 15.6% measured from an aperture area of ∼10.36 cm2, corresponding to an active-area module PCE of 17.9% with a geometric fill factor of ∼87.3%.