Chinese Researchers Achieve 27.31% Certified Efficiency in Inverted Perovskite Solar Cells via Dual-Molecule Interface Engineering

July 12, 2026

perovskite-info.com China

Overview

A Chinese research team has developed a dual-molecule interface engineering strategy for inverted perovskite solar cells (IPSCs), achieving a world-record certified power conversion efficiency of 27.31%. This innovation addresses key challenges of interfacial recombination and chemical instability at the NiOx/perovskite junction, leading to excellent long-term operational stability and scalability. Large-area devices of 766 cm² demonstrated 21.54% efficiency, maintaining 92% of initial efficiency after 2000 hours of continuous light exposure.

In Depth

Key Findings

A team of Chinese researchers has achieved a new world record certified power conversion efficiency of 27.31% for inverted perovskite solar cells (IPSCs) by employing an innovative dual-molecule interface engineering strategy. This breakthrough simultaneously resolves critical efficiency and stability challenges that have been major barriers to the commercialization of perovskite solar cells.

Technical Details

The dual-molecule interface engineering was specifically designed to tackle interfacial recombination losses and chemical instability issues prevalent at the NiOx/perovskite junction. The research team successfully utilized a combination of two distinct molecules, Me-4PACz and CzOTf, to effectively pin charge extraction and passivate lead (Pb) defects at the interface. This approach led to an increase in the open-circuit voltage (Voc) of the device and a significant improvement in long-term operational stability. Notably, large-area devices measuring 766 cm² fabricated with this technology achieved a power conversion efficiency of 21.54%. Furthermore, these devices demonstrated outstanding stability, retaining 92% of their initial efficiency after 2000 hours of continuous light exposure under ambient conditions. The molecular interface also acts as a barrier against ion migration at the NiOx contact, decelerating chemical drift and interfacial phase destabilization.

Background & Context

Inverted perovskite solar cells have garnered significant attention due to their advantageous optical properties and ease of fabrication. However, defects and instabilities at the interface with hole transport layers, such as NiOx, have hindered the simultaneous achievement of high efficiency and long-term stability. This dual-molecule interface strategy represents a groundbreaking approach to fundamentally resolve these issues, making it pivotal for accelerating the commercial deployment of IPSC technology. Achieving high efficiency and stability in large-area devices is a substantial step toward practical applications.

Strategic Significance & Outlook

The impressive 27.31% certified efficiency approaches the theoretical efficiency limits of conventional silicon solar cells, indicating a potential for significant disruption in the existing photovoltaic market. This technology is expected to further enhance the cost-competitiveness and flexibility of perovskite solar cells, fostering their adoption in a wide range of applications, including building-integrated photovoltaics (BIPV) and flexible electronics. Future research will likely focus on further improving the scalability of this technology and evaluating its stability under more extreme environmental conditions to pave the way for widespread commercialization.

Source: https://www.perovskite-info.com/dual-molecule-interface-engineering-enables-2731-efficient-inverted-perovskite

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