Formation of pristine CuSCN layer by spray deposition method for efficient perovskite solar cell with extended stability

By employing CuSCN, a low-cost inorganic hole transporting material (HTM), CH3NH3PbI3 perovskite solar cell (PSC) devices with high efficiency and extended stability were successfully fabricated in this work. In particular, we developed a facile method of depositing CuSCN layer reproducibly by a sim...

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Bibliographic Details
Published in:Nano energy 2017-02, Vol.32, p.414-421
Main Authors: Yang, In Seok, Sohn, Mi Rae, Sung, Sang Do, Kim, Yong Joo, Yoo, Young Jun, Kim, Jeongho, Lee, Wan In
Format: Article
Language:English
Subjects:
CuSCN
Hole transporting material
Perovskite solar cell
Spray deposition
Stability
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Summary:By employing CuSCN, a low-cost inorganic hole transporting material (HTM), CH3NH3PbI3 perovskite solar cell (PSC) devices with high efficiency and extended stability were successfully fabricated in this work. In particular, we developed a facile method of depositing CuSCN layer reproducibly by a simple spray deposition technique, which allows the formation of the CuSCN layer without any significant damage of the underlying CH3NH3PbI3 layer. The fabricated PSC with ~50nm-thick pristine CuSCN layer exhibits the photovoltaic conversion efficiency (PCE) of 17.10% with JSC of 23.10mA/cm2, VOC of 1,013mV and FF of 0.731. Compared with conventional PSCs based on spiro-OMETAD HTM, the PSC employing CuSCN exhibits higher value of JSC, suggesting that CuSCN transports holes more efficiently than spiro-OMETAD. Furthermore, PSCs employing the pristine CuSCN demonstrate a remarkable long-term stability at ambient condition with the decrease of PCE by only 5.8% after 100 days. In addition, the PCE decrease during the encapsulation process at 120°C was merely 13%, which is much lower value than ~70% observed for the conventional device based on spiro-OMETAD, indicating excellent thermal stability of the CuSCN-based PSCs. [Display omitted] •A facile spray deposition technique to deposit the CuSCN HTM layer is developed.•The perovskite layer is not appreciably damaged during the spray deposition of CuSCN.•Perovskite solar cell (PSC) with the pristine CuSCN layer exhibits PCE of 17.10%.•PSCs with the CuSCN demonstrate remarkable long-term and thermal stabilities.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2016.12.059