Scholarlink

<p>Perovskite photoactive layers are promising semiconductor materials due to their appropriate band gap, high charge carrier mobility, and low recombination density. Among them, the hybrid perovskite CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> (MAPbI<sub>3</sub>) is widely studied because of its strong visible light absorption and favorable optoelectronic properties. However, long-term instability and sensitivity to ambient conditions remain major challenges, especially for low-cost fabrication routes. In this study, MAPbI<sub>3</sub> thin films were prepared entirely under ambient air conditions using a one-step spin-coating process. The effects of precursor solution preparation temperature, solvent composition, spin-coating speed and time, as well as annealing temperature and duration were systematically investigated. An optimized film was obtained using a precursor solution stirred at 60&#xa0;°C, spin-coated at 4000&#xa0;rpm for 40&#xa0;s, and annealed at 105&#xa0;°C for 30&#xa0;min. The optimized film exhibited high crystallinity with dominant (<i>110</i>) orientation, absence of detectable PbI<sub>2</sub> phase, and stable optical absorption in the visible region. Structural stability was preserved during the first 24&#xa0;h, followed by gradual degradation over a 60-day aging period under ambient air conditions. In addition, a TiO<sub>2</sub>/MAPbI<sub>3</sub> heterojunction device fabricated using the optimized film showed rectifying dark <i>I</i>-<i>V</i> behavior with a forward turn-on voltage of ~ 0.6&#xa0;V. These results demonstrate that reasonable MAPbI<sub>3</sub> film quality can be achieved under ambient air conditions using a simple and low-cost fabrication approach.</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

Optimization of MAPbI3 photoactive layer via cost-effective single-step spin-coating under ambient air condition

  • 期刊论文

  • 发表日期：

    2026年3月21日

查看全文
  • Merhan Kılıç,
  • Teoman Özdal,
  • Hamide Kavak

摘要

Perovskite photoactive layers are promising semiconductor materials due to their appropriate band gap, high charge carrier mobility, and low recombination density. Among them, the hybrid perovskite CH3NH3PbI3 (MAPbI3) is widely studied because of its strong visible light absorption and favorable optoelectronic properties. However, long-term instability and sensitivity to ambient conditions remain major challenges, especially for low-cost fabrication routes. In this study, MAPbI3 thin films were prepared entirely under ambient air conditions using a one-step spin-coating process. The effects of precursor solution preparation temperature, solvent composition, spin-coating speed and time, as well as annealing temperature and duration were systematically investigated. An optimized film was obtained using a precursor solution stirred at 60 °C, spin-coated at 4000 rpm for 40 s, and annealed at 105 °C for 30 min. The optimized film exhibited high crystallinity with dominant (110) orientation, absence of detectable PbI2 phase, and stable optical absorption in the visible region. Structural stability was preserved during the first 24 h, followed by gradual degradation over a 60-day aging period under ambient air conditions. In addition, a TiO2/MAPbI3 heterojunction device fabricated using the optimized film showed rectifying dark I-V behavior with a forward turn-on voltage of ~ 0.6 V. These results demonstrate that reasonable MAPbI3 film quality can be achieved under ambient air conditions using a simple and low-cost fabrication approach.