Perovskite solar cell stability boosted by resonant molecule design
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Researchers designed a self-assembly monolayer with a donor-acceptor-donor resonant structure that strengthens the anchoring bond to indium tin oxide, preventing desorption under operational stress. The device achieved a certified power conversion efficiency of 27.69% on small cells and maintained negligible decay after 1,080 hours of operation at 85°C.
The Molecular Design
The new SAM features a donor-acceptor-donor (D-A-D) resonant structure that increases negative charge density at the acceptor anchoring group. This strengthens the phosphonic acid-ITO bond, preventing SAM desorption during operation. The approach addresses a key stability challenge in perovskite solar cells, where limited intrinsic bonding strength compromises charge extraction under thermal and light stress.
Performance Metrics
Devices using the D-A-D resonant SAM achieved certified power conversion efficiencies of 27.69% on 0.063 cm² cells and 23.63% on 15.64 cm² modules. Flexible substrates also reached 26.64% efficiency. Under maximum-power-point tracking at 85±5°C for 1,080 hours, the device showed negligible decay, and retained >93% efficiency after 1,080 hours under metal halide lamp illumination. It also survived 720 thermal cycles between -40°C and 85°C with >98% retention.
Broader Implications
The resonant molecular design demonstrates universality across rigid and flexible substrates, offering a pathway to stable, high-efficiency perovskite solar cells. The work was published in Nature by Wu, Kou, Li et al. Further research may explore scaling the approach to larger modules and commercial production.
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