We are delighted to announce that Prof. Gang LI, our Associate Director and his research team have developed a new generation of perovskite–organic tandem solar cells (POTSCs). This paper is published by Nature Materials, which provides a comprehensive understanding of reverse charge transport mechanism in bulk heterojunctions organic solar cells, overcoming reverse-bias instability in perovskite-based solar cells and providing critical guidelines for developing robust POTSCs.
Title: Perovskite–organic tandem solar cells with superior reverse-bias stability
Through strategic material engineering, the team achieved a significant breakthrough by suppressing isolated acceptor clusters within the donor-acceptor intermix region—the power-generating core where charge-transporting materials blend. This intervention minimized structural defects and yielded high-performance organic solar cells (OSCs) with an irreversible breakdown voltage exceeding -35 V, preventing permanent damage from negative voltage within this threshold. When integrated into n-i-p inorganic perovskite-organic tandem devices, these resilient OSCs successfully prevented "reverse tunneling"—the damaging backward current flow that occurs during shading—thereby safeguarding the sensitive perovskite layer. Consequently, the tandem cells demonstrated unprecedented durability, retaining over 90% of their initial efficiency after exposure to an extreme -40 V reverse-bias. The devices also exhibited outstanding long-term stability, maintaining 90% efficiency after 12 hours at -20 V and 97% efficiency after 2,000 hours of continuous operation at -4.5 V, far surpassing all existing thin-film solar technologies.
For more detail, please refer to https://www.nature.com/articles/s41563-026-02541-6
| Research Units | Otto Poon Charitable Foundation Research Institute for Smart Energy |
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