Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Energy Harvesting & Storage Monday Sessions
       Session EH-MoM

Paper EH-MoM7
Two-Step Thermal Annealing Improves the Morphology of Spin-Coated Films for Highly Efficient Perovskite Hybrid Photovoltaics

Monday, December 8, 2014, 10:40 am, Room Lehua

Session: Nano-based Approaches for Photovoltaics
Presenter: ChihPing Chen, Ming Chi University of Technology, Taiwan, Republic of China
Correspondent: Click to Email
We describe the relationships between the morphologies and the power conversion efficiencies (PCE) of perovskite photovoltaics having a conventional p–i–n heterojunction structure, indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS)/CH3NH3PbI3–xClx/PC61BM/Al. The PCE of such a device is highly dependent on the morphology of the perovskite film, which is governed by the concentrations of its precursors and the annealing conditions. A two-step annealing process allowed sufficient crystallization of the perovskite material, with a high coverage at a high precursor concentration. Relative to the device prepared using a one-step process (90 °C for 30 min), we observed a 60% increase in PCE for this optimized device. We observed a PCE of 10% of our optimized cells. Corresponding devices exhibited extremely high stability after long-term storage (>1368 h) in the dark in a N2-filled glove box, with consistently high PCEs (AM 1.5G, 100 mW cm–2).