3 years ago

Dopant-Free Hole-Transport Materials Based on Methoxytriphenylamine-Substituted Indacenodithienothiophene for Solution-Processed Perovskite Solar Cells

Dopant-Free Hole-Transport Materials Based on Methoxytriphenylamine-Substituted Indacenodithienothiophene for Solution-Processed Perovskite Solar Cells
Fang Yao, Guojia Fang, Zhiliang Chen, Zhi-Kuan Chen, Yulong Wang, Xiaolu Zheng, Zong-Xiang Xu, Qi Zhang, Wei Huang, Xiaoyuan Liu
Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high-performance perovskite solar cells (PSCs). The highest-efficiency PSCs use organic HTMs, many of which have low mobilities and therefore require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two new HTMs (IDT–TPA and IDTT–TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron-donating methoxytriphenylamine (TPA) groups as the end-capping units. The extended conjugation in the backbone of IDTT–TPA resulted in stronger π–π interactions (3.321 Å) and a higher hole mobility of 6.46×10−4 cm2 V−1 s−1 when compared with that of IDT–TPA (9.53×10−5 cm2 V−1 s−1). A dopant-free, planar PSC that contained IDTT–TPA was fabricated and exhibited a high power conversion efficiency (PCE) of 15.7 %. This cell exhibited a higher PCE and less hysteresis than devices that contained IDT–TPA. Anti-doping: A power conversion efficiency of 15.7 % was achieved with a perovskite solar cell that incorporated dopant-free methoxytriphenylamine-substituted indacenodithienothiophene (IDTT–TPA) as hole-transport material. IDTT–TPA exhibited a higher hole mobility than methoxytriphenylamine-substituted indacenodithiophene (IDT–TPA) because of its extended fused ring and rigid coplanar structure, which are beneficial for π-electron delocalization, preventing rotational disorder, and increasing π–π interactions.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700197

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.