As the power conversion efficiency (PCE) of single-junction solar cells approaching
its theoretical limit, tandem solar cells have attracted great attention
due to their ability to break this limitation. For example, the PCE of
crystalline silicon-based solar cells (c-Si) reached 26.81% with an area of 274.4
cm2, approaching the theoretical limit of 29.4%. By combining the c-Si with
perovskites, the theoretical PCE limitation of 29.4% can be further increased
to 45%. The wide-bandgap (1.68 eV) inverted (p-i-n) perovskite solar cells
(PSCs) are ideal candidates to integrate on top of narrow-bandgap solar cells
to fabricate tandem solar cells, owing to the simple fabrication process and
tunable bandgap. However, the PCE of wide-bandgap perovskite solar cells is
limited by the severe open-circuit voltage loss due to non-radiative recombination
arising from trap-assisted recombination and interfacial recombination.
In this thesis, Poly[(9,9-bis[3-(trimethylammonium)propyl-2,7-fluorene)]-alt-2,7-
(9,9-dioctylfluorene) diiodide (PFN-I), as modification layer between hole transport
layer (HTL) and perovskite, was applied to efficiently passivate the interfacial
defects, moderate the growth of perovskite crystal and modify the interfacial
energy level alignment to enhance hole extraction. Through comprehensive characterization,
it has been observed that the introduction of PFN-I into the system
effectively reduces non-radiative recombination. Therefore, a PCE of 21.9% with
an open-circuit voltage of 1.24 V and a fill factor of 80% was obtained for 1.68
eV-bandgap inverted PSCs.
| Identifer | oai:union.ndltd.org:kaust.edu.sa/oai:repository.kaust.edu.sa:10754/691760 |
| Date | 17 May 2023 |
| Creators | wang, jiayi |
| Contributors | Bakr, Osman, Physical Science and Engineering (PSE) Division, Mohammed, Omar F., Fatayer, Shadi P. |
| Source Sets | King Abdullah University of Science and Technology |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | 2024-05-18, 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 2024-05-18. |
| Relation | N/A |
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