Bulk Heterojunction Quasi-Two-Dimensional Perovskite Solar Cell with 1.18 V High Photovoltage
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AbstractMulticomponent quasi-two-dimensional perovskites (Q-2DPs) have efficient luminescence and improved stability, which are highly desirable for light-emitting diode and perovskite solar cell (PSC). However, the lack of radiative recombination at room temperature is still not well understood and the performance of PSC is not good enough as well. The open-circuit voltage (VOC) is even lower than that of three-dimensional (3D) PSC with a narrower band gap. In this work, we study the energy transfer of excitons between their multiple components by time-resolved photoluminescence and find that charge transfer from high-energy states to low-energy state is gradually suppressed during elevating temperature owing to trap-mediated recombination. This may reveal the bottleneck of luminescence at room temperature in Q-2DPs, leading to large photovoltage loss in 2D PSC. Therefore, we develop a p–i–n bulk heterojunction (BHJ) structure to reduce the nonradiative recombination and obtain high VOC of 1.18 V for (PMA)2MA4Pb5I15Cl (33.3% PMA) BHJ device, much higher than that of the planar counterparts. The enhanced efficiency is attributed to the improved exciton dissociation via BHJ interface. Our results provide an important step toward high VOC and stable 2D PSCs, which could be used for tandem solar cell and colorful photovoltaic windows.
All Author(s) ListWang H, Cheng GH, Xie JS, Zhao SH, Qin MC, Chan CCS, Qiu YC, Chen GX, Duan CH, Wong KS, Wang JN, Lu XH, Xu JB, Yan KY
Journal nameACS Applied Materials and Interfaces
Year2019
Month1
Day23
Volume Number11
Issue Number3
PublisherAmerican Chemical Society
Pages2935 - 2943
ISSN1944-8244
LanguagesEnglish-United Kingdom
Keywordstwo-dimensional perovskite, trap-mediated recombination, energy-transfer bottleneck, bulk heterojunction, large photovoltage
Web of Science Subject CategoriesNanoscience & Nanotechnology;Materials Science, Multidisciplinary;Science & Technology - Other Topics;Materials Science

Last updated on 2020-02-04 at 23:20