Scholarlink

<p>Introducing passivation molecules has been being considered as one of effective strategies to reduce surface crystal defects and hence improve the performance and stability of perovskite solar cells (PSCs). In this paper, we report the effects of organofluorine molecules, specifically trifluoroacetic acid (TFA), added in the ethyl acetate (EA) anti-solvent on the characteristics of&#xa0;MAPbI<sub>3</sub> based PSCs, which are related to interfacial surface states, band bending characteristics and charge extraction processes. Anti-solvents with several volume&#xa0;fractions of TFA were used in the perovskite layer deposition step by the spin-coating technique. The current density vs. voltage (<i>J–V</i>) curve hysteresis was suppressed while the PSC&#xa0;stability and the PSC performance&#xa0;repeatability of the&#xa0;fabrication results were much&#xa0;improved&#xa0;in PSC prepared using EA anti-solvent with moderate volume fraction&#xa0;of TFA (i.e.&#xa0;5% v/v). These PSC samples were also characterized by measurements of impedance photovoltaic spectroscopy (IMVS) and transient photovoltaic (TPV). By performing TPV measurements at various dc light biases, an unusual delayed TPV decay component with a long rise part was observed, especially at PSCs prepared with&#xa0;moderate volume fractions&#xa0;of TFA in EA anti-solvent.&#xa0;The infra-red (FTIR) spectroscopy and X-ray Photoemission Spectroscopy (XPS) data&#xa0;showed that TFA removed uncoordinated or&#xa0;weakly bonded MA<sup>+</sup> cations&#xa0;and I<sup>−</sup>&#xa0;anions at the NCs surface but leaving the accumulation of Pb<sup>2+</sup>&#xa0;cations on&#xa0;the&#xa0;surface. This condition causes&#xa0;the formation of surface states leading to a downward band bending at the MAPbI<sub>3</sub>/HTL interface, which is&#xa0;responsible to the observation&#xa0;this&#xa0;delayed TPV decay component. However, this situation&#xa0;improves&#xa0;the PSC performance&#xa0;by minimizing the effect from mobile ion migration.&#xa0;These present&#xa0;measurement results thus clearly&#xa0;reveal the aforesaid effects of TFA addition in the anti-solvent on the perovskite layer surface at perovskite/HTL interface. The findings elucidated in this study may provide critical insights that are advantageous in the development of effective passivation molecules and passivation processes to advance PSC with high efficiency and stability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The effect of anti-solvent containing organofluorine molecules on the characteristics of charge carriers transport and extraction in MAPbI3 based perovskite solar cells

  • 期刊论文

  • 发表日期：

    2025年6月25日

查看全文
  • Adhita Asma Nurunnizar,
  • Mohammad Fadli Alifvian,
  • Nur Fadhilah Syarif,
  • Herman Bahar,
  • Rahmat Hidayat,
  • Shobih Shobih,
  • Natalita Maulani Nursam,
  • Hitoshi Kubo,
  • Akihiko Fujii,
  • Masanori Ozaki

摘要

Introducing passivation molecules has been being considered as one of effective strategies to reduce surface crystal defects and hence improve the performance and stability of perovskite solar cells (PSCs). In this paper, we report the effects of organofluorine molecules, specifically trifluoroacetic acid (TFA), added in the ethyl acetate (EA) anti-solvent on the characteristics of MAPbI3 based PSCs, which are related to interfacial surface states, band bending characteristics and charge extraction processes. Anti-solvents with several volume fractions of TFA were used in the perovskite layer deposition step by the spin-coating technique. The current density vs. voltage (J–V) curve hysteresis was suppressed while the PSC stability and the PSC performance repeatability of the fabrication results were much improved in PSC prepared using EA anti-solvent with moderate volume fraction of TFA (i.e. 5% v/v). These PSC samples were also characterized by measurements of impedance photovoltaic spectroscopy (IMVS) and transient photovoltaic (TPV). By performing TPV measurements at various dc light biases, an unusual delayed TPV decay component with a long rise part was observed, especially at PSCs prepared with moderate volume fractions of TFA in EA anti-solvent. The infra-red (FTIR) spectroscopy and X-ray Photoemission Spectroscopy (XPS) data showed that TFA removed uncoordinated or weakly bonded MA+ cations and I− anions at the NCs surface but leaving the accumulation of Pb2+ cations on the surface. This condition causes the formation of surface states leading to a downward band bending at the MAPbI3/HTL interface, which is responsible to the observation this delayed TPV decay component. However, this situation improves the PSC performance by minimizing the effect from mobile ion migration. These present measurement results thus clearly reveal the aforesaid effects of TFA addition in the anti-solvent on the perovskite layer surface at perovskite/HTL interface. The findings elucidated in this study may provide critical insights that are advantageous in the development of effective passivation molecules and passivation processes to advance PSC with high efficiency and stability.