Study of inverted planar CH3NH3PbI3 perovskite solar cells fabricated under environmental conditions

• Published in: Solar energy Vol. 180; pp. 594 - 600
• Main Authors: Montoya, Marco Polo, Sidhik, Siraj, Esparza, Diego, López-Luke, Tzarara, Zarazua, Isaac, Rivas, Jesús Manuel, De la Rosa, Elder
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01-03-2019; Pergamon Press Inc
• Subjects: Circuits; Crystal growth; Crystal structure; Current carriers; Electronics industry; Environmental conditions; Fabrication; Inverted structure; Organic semiconductors; Perovskite; Perovskites; Photovoltaic cells; Photovoltaics; Pinholes; Relative humidity; Short circuit currents; Solar cells; Solar energy; Solvents; Titanium dioxide; Solar cells; Perovskite; Inverted structure
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2019.01.061

•An efficiency of 10% was obtained with the inverted perovskite configuration under ambient condition.•The anti-solvent method was used to fabricated the perovskite film for solar cells.•The morphological, optic and photovoltaic analyses indicate that the right combination of these two parameters.
Organic-inorganic inverted perovskite solar cells have been analyzed. This structure uses organic semiconductors as electron and hole selective electrodes and the perovskite as light harvesting layer. The anti-solvent deposition method is a frequently used techniques in the elaboration of conventional perovskite solar cells (FTO/TiO2/CH3NH3PbI3/Spiro-OMetad/Au). However, the anti-solvent method is seldom used in the inverted structure. In this work, we use the anti-solvent method to fabricate the perovskite film for solar cells in the ITO/PEDOT:PSS/CH3NH3PbI3/PC61BM/Ag configuration, systematically studying the effect of the anti-solvent dripping time and the relative humidity in cell fabrication and performance. The morphological, optical and photovoltaic analyses indicate that the right combination of these two parameters will result in a preferential crystal growth in the (1 1 0) orientation. This allows the formation of homogeneous pinhole-free films that enhance light harvesting and reduce charge-carrier leakage, hence increasing short circuit current and fill factor to obtain a photo-conversion efficiency of about ∼10%.