Integrated Perovskite/Bulk-Heterojunction toward Efficient
Solar Cells
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Abstract
We
successfully demonstrated an integrated perovskite/bulk-heterojunction
(BHJ) photovoltaic device for efficient light harvesting and energy
conversion. Our device efficiently integrated two photovoltaic layers,
namely a perovskite film and organic BHJ film, into the device. The
device structure is ITO/TiO<sub>2</sub>/perovskite/BHJ/MoO<sub>3</sub>/Ag. A wide bandgap small molecule DOR3T-TBDT was used as donor in
the BHJ film, and a power conversion efficiency (PCE) of 14.3% was
achieved in the integrated device with a high short circuit current
density (<i>J</i><sub>SC</sub>) of 21.2 mA cm<sup>โ2</sup>. The higher <i>J</i><sub>SC</sub> as compared to that
of the traditional perovskite/HTL (hole transporting layer) device
(19.3 mA cm<sup>โ2</sup>) indicates that the BHJ film absorbs
light and contributes to the current density of the device. Our result
further suggests that the HTL in traditional perovskite solar cell,
even with good light absorption capability, cannot contribute to the
overall device photocurrent, unless this HTL becomes a BHJ layer (by
adding electron transporting material like PC<sub>71</sub>BM)