Perovskite Solar Cells Based on Self-assembled Hole-Extraction Monolayer with Conjugated Polyelectrolyte
Chi-Yuan Chang a b, Leeyih Wang a c, Yang-Fang Chen b, Fang-Chi Hsu d
a Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
b Department of Physics, National Taiwan University, Taipei 106, Taiwan.
c Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
d Department of Material Science and Engineering, National United University, Miaoli 36063, Taiwan.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Chi-Yuan Chang, 092
Publication date: 11th February 2019

Reproducibility and lifetime are two major issues in solar cell industry. Here we adopt the polyelectrolyte P3HT-COOH to replace PEDOT:PSS as hole extracting material. Due to a more desirable match of work function(-5.32eV) of P3HT-COOH to perovskite layer compared with PEDOT:PSS(-5.25eV) with photoelectron spectrometer. We find open circuit voltage of devices can be improved from 0.86 volts to 1.04 volts. Meanwhile, a more hydrophobic surface of P3HT-COOH lead to large perovskite grain size which induce higher Jsc from 17.11 to 20.68mA/cm2. Besides, in our study we present a novel self-assembled method to deposit hole-extraction-monolayer. This monolayer is being formed through dipping the ITO glass into the solution which make this process much cheaper than others. It behaves great potential to reduce material consumption and process simplification. With traditional spin coating process, an average efficiency of 17.01% can be obtained if we use P3HT-COOH as HEL. With the self-assembled method, an average efficiency above 18.37% and open circuit voltage 1.08 volts can be obtained. Nevertheless, the standard deviation of efficiency can be improved from 0.47% to 0.25% with this approach, which may come from fewer conformational defects. Meanwhile, device stability maintains more than 80% with this method under ~55% relative humidity after 1 month. We find It has the ability to prohibit the open circuit voltage decay(less than 1%). Therefore, it is promising in solar cell commercialization.Reproducibility and lifetime are two major issues in solar cell industry. Here we adopt the polyelectrolyte P3HT-COOH to replace PEDOT:PSS as hole extracting material. Due to a more desirable match of work function(-5.32eV) of P3HT-COOH to perovskite layer compared with PEDOT:PSS(-5.25eV) with photoelectron spectrometer. We find open circuit voltage of devices can be improved from 0.86 volts to 1.04 volts. Meanwhile, a more hydrophobic surface of P3HT-COOH lead to large perovskite grain size which induce higher Jsc from 17.11 to 20.68mA/cm2. Besides, in our study we present a novel self-assembled method to deposit hole-extraction-monolayer. This monolayer is being formed through dipping the ITO glass into the solution which make this process much cheaper than others. It behaves great potential to reduce material consumption and process simplification. With traditional spin coating process, an average efficiency of 17.01% can be obtained if we use P3HT-COOH as HEL. With the self-assembled method, an average efficiency above 18.37% and open circuit voltage 1.08 volts can be obtained. Nevertheless, the standard deviation of efficiency can be improved from 0.47% to 0.25% with this approach, which may come from fewer conformational defects. Meanwhile, device stability maintains more than 80% with this method under ~55% relative humidity after 1 month. We find It has the ability to prohibit the open circuit voltage decay(less than 1%). Therefore, it is promising in solar cell commercialization.

Authors acknowledge the funding supported by Ministry of Science and Technology, Taiwan (Grant no. MOST105‐2119‐M‐002‐030‐MY3 and MOST105-2112-M-239-001-MY3)

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