What the study found
The study found that an asymmetric small molecule substrate, CPP-2PACz, helped improve chemical vapor deposition (CVD) growth of perovskite films. The resulting semitransparent perovskite solar cells reached 19.0% efficiency.
Why the authors say this matters
The authors say low-pressure CVD is promising for perovskite photovoltaics commercialization, but its performance is limited by poor film quality. The study suggests that regulating film growth with the designed molecule can improve film quality and device performance.
What the researchers tested
The researchers designed and synthesized a new asymmetric small molecule hole transporting material substrate based on an indolocarbazole core, called (2‐(12‐phenylindolo[2,3‐a]carbazol‐11(12H)‐yl)ethyl)phosphonic acid (CPP‐2PACz). They used it to regulate perovskite growth during low-pressure CVD.
What worked and what didn't
The large dipole of CPP-2PACz was reported to facilitate a dense transporting layer, slow the CVD reaction rate, and produce larger perovskite grain sizes, improved interfacial energy level alignment, and more efficient charge transfer at the interface. Champion efficiencies of 21.0% for opaque cells, 19.0% for semitransparent cells, and 16.8% for semitransparent mini-modules were achieved. The semitransparent devices retained about 90% of their initial performance after 800 hours under the ISOS-L-1 protocol.
What to keep in mind
The abstract does not provide detailed limitations beyond noting that film quality is a constraint for low-pressure CVD. The results reported are champion efficiencies and stability under the specified operating protocol.
Key points
- CPP-2PACz, an asymmetric small molecule substrate, was used to regulate perovskite growth in low-pressure CVD.
- The molecule’s large dipole was reported to form a dense transporting layer and slow the CVD reaction rate.
- Perovskite films showed larger grain sizes, improved interfacial energy level alignment, and more efficient interfacial charge transfer.
- Champion efficiencies reached 21.0% for opaque cells and 19.0% for semitransparent cells.
- Semitransparent devices retained about 90% of initial performance after 800 hours under ISOS-L-1 conditions.
- A champion efficiency of 16.8% was achieved for semitransparent mini-modules.
Disclosure
- Research title:
- CVD-enabled perovskite solar cells reached 19% semitransparent efficiency
- Authors:
- Yijie Wang, Y J Zhang, Ning Teng, Xinyan Hou, Bingxin Duan, Tailong Lv, Min Hu, Wenping Yin, Jianfeng Lu
- Institutions:
- Wuhan University of Technology, Qingdao Center of Resource Chemistry and New Materials, Wuhan Textile University, Qingdao University, Harbin Engineering University
- Publication date:
- 2026-04-20
- OpenAlex record:
- View
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