Nanjing University EES: 24.9% efficiency! Enhanced interfacial adhesion through polymer hole transport materials enables high-performance air-processing perovskite solar cells

Chen Shangshang's team at Nanjing University published a research paper titled "Enhanced interface adhesion with a polymeric hole transporter enabling high-performance air-processed perovskite solar cells" in the journal Energy & Environmental Science. Zhao Yu is the first author, and Chen Shangshang is the corresponding author.

Key Highlights: This paper develops a novel polymeric hole transporter (Poly-DCPA) with enhanced properties. Compared to self-assembled monolayers (SAMs), its adhesion to TCOs is significantly improved. Poly-DCPA also exhibits excellent conductivity and uniformity, enabling blade-coated PSCs fabricated under ambient conditions to achieve a power conversion efficiency of 24.9%. Furthermore, the poly-DCPA-based perovskite solar cells exhibit excellent stability, retaining 94% of their initial efficiency after over 900 hours of light immersion at 85°C.

Perovskite solar cells (PSCs) are a promising solar technology that have demonstrated rapid efficiency gains in recent years. However, strong adhesion between the hole transport layer and the transparent conducting oxide is crucial for efficient charge transport and interfacial stability in inverse perovskite solar cells.

In light of this, Chen Shangshang's team at Nanjing University has demonstrated the ability to enhance interfacial adhesion through polymer hole transport materials, enabling high-performance air-processing perovskite solar cells. Through rational hole transport material design, interfacial adhesion can be significantly improved. They designed poly-DCPA, a novel polymer hole transport material that exhibits over fourfold enhanced adhesion compared to self-assembled monolayers (SAMs) of DCPA. Poly-DCPA also exhibits superior conductivity and improved uniformity, enabling blade-coated perovskite solar cells fabricated under ambient conditions to achieve a power conversion efficiency of 24.9%. This surpasses the performance of perovskite solar cells using DCPA SAMs as hole transport layers. Furthermore, the poly-DCPA-based perovskite solar cells exhibited excellent stability, retaining 94% of their initial efficiency after over 900 hours of light immersion at 85°C.

This study proposes a promising strategy for significantly improving interfacial adhesion through rational hole transporter design. This introduces a promising HTL material for inverted PSCs, paving the way for achieving higher efficiencies and enhanced stability in future devices.

Source:

https://doi.org/10.1039/D4EE04481A