Publication date: 4th October 2024
Optimizing the interface between the perovskite and transport layers, and modifying electron transport layer (ETL) are critical for enhancing the performance of perovskite solar cells. Herein, we introduced three conjugated polymers (DPPF-BDD, DPPT-BDD and DPPSe-BDD) as antisolvent additive and ETL blending. After polymer treated, PSCs displayed maximum PCE of 23.48%, 22.85% and 23.35%, respectively, surpassing the control device (22.83%), which was benefited from the perovskite near-infrared (NIR) region absorption[1], surface passivation and the electron transport layer (ETL) charge extraction improvement. Finally, we performed the long-term stability test for DPPF-BDD, DPPT-BDD and DPPSe-BDD based PSCs stability at 85oC in glovebox. The control device degraded to 39.8% of its initial PCE after 240 h. The DPPF-BDD, DPPT-BDD and DPPSe-BDD treated devices still remained 74.8%, 57.6% and 43.0% of the initial PCE after 430 h respectively. The stability improvement is attributed to the passivation effect, which effectively smoothed perovskite surface and reduced defects.
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