期刊
SMALL
卷 15, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201900606
关键词
charge extraction; heterojunctions; interfaces; nanowires; perovskites
类别
资金
- National Natural Science Foundation of China [51472274]
- GDUPS
- Australian Research Council (ARC) [DE180101190]
- ARC through its Discovery program
- Australian Research Council [DE180101190] Funding Source: Australian Research Council
Ordered 1D metal oxide structure is desirable in thin film solar cells owing to its excellent charge collection capability. However, the electron transfer in 1D electron transporting layer (ETL)-based devices is still limited to a submicrometer-long pathway that is vertical to the substrate. Here, an innovative closely packed rutile TiO2 nanowire (CRTNW) network parallel to the facet of fluorine-doped tin oxide (FTO) substrate is reported, which can serve as a 1D nanoscale electron transport pathway for efficient perovskite solar cells (PSCs). The PSC constructed using newly prepared CRTNW ETL achieves an impressive power conversion efficiency of 21.10%, which can be attributed to the facilitated electron extraction induced by the favorable junctions formed at FTO/ETL and ETL/perovskite interfaces and also the suppressed charge recombination originating from improved perovskite morphology with large grains, flat surface, and good surface coverage. The bifacial contact junctions engineering also enables large-area device fabrication. The PSC with 1 cm(2) aperture yields an efficiency of 19.50% under one sun illumination. This work highlights the significance of controlling the orientation and packing density of the ordered 1D oxide nanostructured thin films for highly efficient optoelectronic devices in a large-scale manner.
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