A Three‐Step Method for the Deposition of Large Cuboids of Organic–Inorganic Perovskite and Application in Solar Cells. Issue 15 (11th May 2016)

• Record Type: Journal Article
• Authors: Shahbazi, Saeed; Malekshahi Byranvand, Mahdi; Tajabadi, Fariba; Afshar, Shahrara; Taghavinia, Nima
• Is Part Of: Chemphyschem. Volume 17:Issue 15(2016)
• Page Start: 2389
• Page End: 2394
• Publication Date: 2016-05-11
• Subjects: electrochemistry -- perovskite phases -- solar cells -- synthesis design -- thin films; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201600229
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: A three‐step method for the deposition of CH3 NH3 PbI3 perovskite films with a high crystalline structure and large cuboid overlayer morphology is reported. The method includes PbI2 deposition, which is followed by dipping into a solution of C4 H9 NH3 I (BAI) and (BA)2 PbI4 perovskite formation. In the final step, the poorly thermodynamically stable (BA)2 PbI4 phase converts into the more stable CH3 NH3 PbI3 perovskite by dipping into a solution of CH3 NH3 I. The final product is characterized by XRD, SEM, UV/Vis, and photoluminescence analysis methods. The experimental results indicate that the prepared perovskite has cuboids with high crystallinity and large sizes (up to 1 μm), as confirmed by XRD and SEM data. Photovoltaic investigations show that the three‐step method results in higher solar cell efficiency (15 % enhancement in efficiency) with a better reproducibility than the conventional two‐step deposition method. Abstract : Slowly does it ! A new three‐step method includes PbI2 deposition, followed by dipping into a solution of C4 H9 NH3 I (BAI), to form (BA)2 PbI4 perovskite. In the final step, the poorly thermodynamically stable (BA)2 PbI4 perovskite converts into the more stable CH3 NH3 PbI3 phase through dipping into a solution of CH3 NH3 I (MAI; see figure). The product CH3 NH3 PbI3 perovskite films show highly crystalline structure with overlayers composed of large cuboids.