期刊
SOLAR RRL
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202300606
关键词
carbon electrodes; charge transport; interlayers; perovskite solar cells; quantum dots
For the first time, a perovskite quantum dot interlayer is used to solve the interface issue in carbon-based hole transport material-free perovskite solar cells, which acts as a morphology changer, defect passivator, and photogenerated hole extractor. Compared with the pristine perovskite film, the PQD-modified perovskite absorber shows increased contact area and high compatibility with the carbon electrode, leading to an improvement in device efficiency from 16.71% to 17.93%.
The realization of improved charge transport with suppressed recombination at the interface of perovskite and carbon electrode is the main key for remarkably increasing the power conversion efficiency of carbon-based hole transport material (HTM)-free perovskite solar cells (PSCs). Herein, a strategy that builds a perovskite quantum dot (PQD) interlayer is demonstrated, for the first time, to bridge the perovskite absorber and carbon electrode for solving the interface issue in HTM-free PSCs. It is found that the introduced PQD interlayer concurrently functions as a morphology changer, a defect passivator, and a photogenerated hole extractor. Compared with the pristine perovskite film, the PQD-modified perovskite absorber shows increased contact area and high compatibility with carbon electrode, prolonged carrier lifetime, deduced defect density as well as suppressed recombination. These positive effects, combined with a heterostructure created by perovskite bulks and PQDs facilitating hole transport at the interface, enable an improvement in device efficiency from 16.71% to 17.93%. The interface issue between the carbon electrode and perovskite absorber is considered as the main barrier preventing the development of hole transport material-free carbon-based perovskite solar cells. An interlayer comprised of nano-sized perovskite quantum dots with surface capping ligands can be employed as hole extractor, defect passivator, and morphology changer, concurrently, for achieving high-performance photovoltaic devices.image & COPY; 2023 WILEY-VCH GmbH
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