Wide-bandgap metal halide perovskite solar cells have become an alluring
next-generation solar panel technology because of their simple manufacturing
and rising efficiencies by up to 25.7%. When the single junction devices face the
ultimate S-Q limit, the incorporation of wide-bandgap perovskite materials with
low-bandgap absorbers to form multi-junction cells offers a promising route to
surpass the theoretical efficiency. Monolithic perovskite-organic tandem cells are
appealing among other compositions owing to the combination of the sub-cells
advantages: low-cost, flexibility, and solution processing.
In this work, we focused on optimizing the hole transporting materials (HTMs)
separately for the two components in tandem devices. In the 1.76 eV perovskite
subcell, three commonly seen HTMs are selected (2PACz, NiOx and
PTAA) to investigate the influence on device performance. An MgF2 interlayer
at perovskite/C60 is deposited as passivation to enhance the voltage and
overall performance. It is found that 2PACz is most suitable for triple cation
FA0.7MA0.15Cs0.15Pb(I0.6Br0.4)3, giving good crystallinity, energy match and absorption
with a champion PCE of 16.12%. Then, we performed a similar optimization
for ternary PM6: BTP-eC9: PC70BM with MoOx, MoOx/2PACz, and
PEDOT: PSS as HTMs, where MoOx/2PACz present the best statistics. Finally,
two terminal tandem devices were fabricated based on the two optimized subcells,
and a promising efficiency of 23.6% and a Voc of 2.09V were reached free
of hysteresis. More passivation methods or perovskite bandgap engineering are
expected to further improve the performance and break the record.
| Identifer | oai:union.ndltd.org:kaust.edu.sa/oai:repository.kaust.edu.sa:10754/691432 |
| Date | 04 1900 |
| Creators | He, Mingjie |
| Contributors | Tung, Vincent, Physical Science and Engineering (PSE) Division, Anthopoulos, Thomas D., Heeney, Martin |
| Source Sets | King Abdullah University of Science and Technology |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | 2024-05-03, At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis will become available to the public after the expiration of the embargo on 2024-05-03. |
| Relation | N/A |
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