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Photon management effects of hybrid nanostructures/microstructures for organic‐silicon heterojunction solar cells

Photon management and carrier separation play crucial roles on designing highly efficient organic‐silicon heterojunction solar cells. Aiming at suppressing optical reflection loss and improving carrier separation efficiency simultaneously, in this paper, we experimentally fabricated hybrid nanostructured/microstructured surfaces by combining the advantages of microstructures and nanostructures. The hybrid nanostructured/microstructured surfaces were prepared by stacking nanoholes on the micropyramids via using a cost‐effective method. In terms of the optical properties, the light reflection, angle‐dependent light absorption, and polarization‐dependent light absorption of the different structured surfaces were investigated. The results indicated that the hybrid nanostructures/microstructures exhibited ultralow reflection in the broadband wavelength range of 300 to 1100 nm (average reflection is 1.8%). Meanwhile, the hybrid nanostructured/microstructured surfaces possessed superior omnidirectional and polarization‐independent properties compared to the unitary structures such as pyramid and nanohole. Furthermore, these different structured surfaces were simply used to fabricate the PEDOT:PSS/n‐Si heterojunction solar cells to show the electrical properties. It was found that the PEDOT:PSS/hybrid Si solar cells showed a PCE of 9.96%, which was greater than the PEDOT:PSS/pyramid Si and PEDOT:PSS/black Si solar cells, owing to the compromise among light absorption, junction area, and minority carrier lifetime. The present work will provide a promising way to fabricate high‐performance and low‐cost PEDOT:PSS/n‐Si heterojunction solar cells by using hybrid nanostructured/microstructured surfaces.