Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.035
Publication date: 18th October 2023
Self-assembled monolayers (SAMs) have emerged as an important area of research for enhancing the efficiency of inverted perovskite solar cells (PVSCs) through improved hole extraction and interfacial passivation. SAMs based on carbazole and various alkyl linkers (e.g., MeO-2PACz and Me-4PACz) have been extensively studied for their potential as commercial SAMs. Recently, researchers have designed innovative SAMs with multifunctionality to enhance charge transport properties and interfacial contacts to simultaneously improve PVSC performance and stability.
In this work, we try to optimize the hole-selective contacts of PVSC by applying and researching two novel SAMs with conjugated linkers and end-group modifications. In this study, two self-assembled monolayers (SAMs) were designed, each featuring a phenyl linker and electron-rich carbazole core and triarylamine end group, respectively. Surprisingly, the PA SAM inhibits excess PbI2 formation and provides efficient hole extraction ability, leading to increasing photoluminescence quantum yield (PLQY), better energy level alignment, and shorter PL lifetime. By applying to inverted PVSC devices, PA exhibited the highest power conversion efficiency (PCE) due to increased Voc & FF. Following effective passivation treatment with phenethylammonium iodide (PEAI), the PVSC with PA SAM achieved a PCE over 23%, and minimal non-radiative recombination loss of less than 100 meV, validated by full energy-loss measurements. In summary, this research explored the structural design of self-assembled monolayers with common functional group moieties and extended conjugation, optimizing hole-selective contacts for efficient inverted PVSCs.
The authors thank financial supports from the National Science and Technology Council (NSTC) in Taiwan (110-2923-E-002-007-MY3, 111-2124-M-002-021, 111-2923-E-002-006-MY3, 112-2628-E-002-031-, and 112-2223-E-002-008-MY4) and from Top University Project of National Taiwan University (112L7810).
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