Abstract
Integrated perovskite/organic solar cells (IPOSCs) based on CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>/PM6:Y6(BTP-4F) are successfully prepared through process innovation and thin film optimization technology. The quality of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>/PM6:Y6 mixed films is greatly optimized, and the interlayer ohmic contact is obtained by regulating the additive DIO and annealing treatment. At the same time, the mobility of holes and electrons in the organic layer in the near infrared region are, respectively, 8.3×10<sup>–3</sup> cm<sup>2</sup>/(V·s) and 8.8×10<sup>–3</sup> cm<sup>2</sup>/(V·s), which can match the mobility of holes and electrons in the visible perovskite layer, achieving the carrier transport balance in the microscopic pathway. The device has high short-circuit current density <i>J</i><sub>sc</sub> and high filling factor FF. In addition, by optimizing the mass ratio of polymer non-fullerene system PM6:Y6 to form a film, the density of non-radiation recombination sites and carrier recombination in the film are significantly reduced, making the extraction and transport of electrons and holes more efficient, and providing greater driving force to improve carrier transport. At the same time, a wider depletion region is formed to inhibit carrier recombination and increase the open-circuit voltage <i>V</i><sub>oc</sub>. The short-circuit current density of the optimized integrated solar cell increases to 25.88 A/cm<sup>2</sup>, the open-circuit voltage <i>V</i><sub>oc</sub> increases to 1.18 V, the filling factor FF reaches 80%, the optical response expands to 950 nm, the external quantum efficiency reaches 90% in the visible region, and the optimal energy conversion efficiency is as high as 24.42%. This is one of the highest efficiencies reported in IPOSCs. The results show that it is an effective method to enhance the near-infrared light absorption of perovskite solar cells and improve the performance of IPOSCs by combining the materials in visible region and the polymer non-fullerene system in near infrared region and optimizing the device structure. It lays a theoretical foundation for developing high efficiency IPOSCs in the future.
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