Publication date: 4th October 2024
Self-assembled monolayers (SAMs) are gaining significant attention in perovskite solar cells (PSCs) for their ability to enhance efficiency in both single-junction and tandem devices. However, their widespread application is hindered by poor reproducibility caused by incomplete surface coverage and voids at the buried perovskite interface. [1] In this study, we present a simple yet effective approach to enhance PSC reproducibility by introducing an amphiphilic conjugated polyelectrolyte between the SAMs and perovskite layers. [2]This polyelectrolyte improves device performance by creating a 200 meV shallower perovskite Fermi level, resulting in enhanced band bending at the SAM/perovskite interface. A novel imaging technique further reveals that the polyelectrolyte minimizes interfacial voids, ensuring complete coverage of the ITO/SAMs surface. Consequently, the devices exhibit remarkable fill factors exceeding 0.84 and power conversion efficiencies surpassing 22.5%. Additionally, exceptional reproducibility is achieved, with an average fill factor of 0.81 and a standard deviation of less than 0.01 across 50 devices. These findings highlight a universal strategy to improve the reproducibility and performance of SAMs-based PSCs, paving the way for the broader adoption of amphiphilic conjugated polyelectrolytes in various optoelectronic applications.
We acknowledge support from the National Science and Technology Council (grants 110-2222-E-005-005-MY3, 112-2628-E-005-002, and 112-2218-E-007-020), as well as the Innovation and Development Center of Sustainable Agriculture and the Innovative Center on Sustainable Negative-Carbon Resources under the Featured Areas Research Center Program, funded by the Higher Education Sprout Project of the Ministry of Education (MOE) in Taiwan.
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