Tailoring the π-conjugation in self-assembled hole-selective molecules for perovskite photovoltaics

Zhao K., Yao L., Liu C., YAVUZ İ., Shen J., Shi P., ...Daha Fazla

Science China Materials, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s40843-024-3093-9
  • Dergi Adı: Science China Materials
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Anahtar Kelimeler: electronic properties, operational stability, perovskite solar cells, self-assembled molecules, π-conjugation structures
  • Marmara Üniversitesi Adresli: Evet

Özet

Self-assembled molecules (SAMs), which consist of a π-conjugated unit and an anchoring group linked by a side chain, play a critical role in functioning as hole-selective contacts. They significantly influence the performance and stability of inverted perovskite solar cells (PSCs). Current research primarily focuses on optimizing the side chains to enhance device performance. However, the effects of π-conjugation structures on the power conversion efficiency (PCE) and stability of PSCs remain largely unexplored. In this study, we designed a series of SAMs featuring gradually extended π-conjugation structures while maintaining a fixed anchoring group, in order to elucidate the impact of extended π-conjugation on electronic properties. As the π-conjugation of the SAM core structure was extended, we observed an improvement in device performance due to enhanced hole extraction and transport. Furthermore, the operational stability of PSCs increased as intermolecular π-π interactions strengthened. The SAM with the optimal π-conjugation structure, referred to as Py2, resulted in an inverted PSC with enhanced operational stability and a PCE of up to 25.2%. (Figure presented.)