Journal
ADVANCED SCIENCE
Volume 6, Issue 14, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900548
Keywords
2D Ruddlesdden-Popper perovskites; 3D phase; air stability; low-temperature fabrication; planar solar cells
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Funding
- Inter-Governmental International Cooperation Projects of Science and Technology Commission of Shanghai Municipality (STCSM) [17520710100]
- Danish Council for Independent Research [7026-0037B]
- Swedish Research Council [2017-05337]
- Swedish Energy Agency [446511-1]
- STINT
- KAW foundation
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2D Ruddlesden-Popper (RP) perovskite solar cells have manifested superior operation durability yet inferior charge transport compared to their 3D counterparts. Integrating 3D phases with 2D RP perovskites presents a compromise to maintain respective advantages of both components. Here, the spontaneous generation of 3D phases embedded in 2D perovskite matrix is demonstrated at room temperature via introducing S-bearing thiophene-2-ethylamine (TEA) as both spacer and stabilizer of inorganic lattices. The resulting 2D/3D bulk heterojunction structures are believed to arise from the compression-induced epitaxial growth of the 3D phase at the grain boundaries of the 2D phase through the Pb-S interaction. The as-prepared 2D TEA perovskites exhibit longer exciton diffusion length and extended charge carrier lifetime than the paradigm 2D phenylethylamine (PEA)-based analogues and hence demonstrate an outstanding power conversion efficiency of 7.20% with significantly increased photocurrent. Dual treatments by NH4Cl and dimethyl sulfoxide are further applied to ameliorate the crystallinity and crystal orientation of 2D perovskites. Consequently, TEA-based devices exhibit a stabilized efficiency over 11% with negligible hysteresis and display excellent ambient stability without encapsulation by preserving 80% efficiency after 270 h storage in air with 60 +/- 5% relative humidity at 25 degrees C.
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