Journal
FRONTIERS IN MATERIALS
Volume 6, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2019.00200
Keywords
dithiol; stability; interface; perovskite solar cell; efficiency
Categories
Funding
- National Key Research and Development Program of China [2016YFB0700700]
- National Natural Science Foundation of China [51673025]
- Beijing Municipal Science and Technology Project [Z181100005118002]
- Young Talent Thousand Program
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Unreacted lead iodide is commonly believed playing an important role in the performance of perovskite solar cells (PSCs). However, the excess lead iodide acts like a double-edged blade, which hampers the long-term stability of devices. Here, we used the ethanedithiol (EDT) as the solvent to process Spiro-OMeTAD (Spiro) layer. Due to the strong coordination between EDT and Pb (II), the unreacted Pbl(2) at the perovskite films surface was effectively passivated, which suppressed the degradation of the perovskite layer without sacrificing the efficiency. Moreover, the hydrophobic EDT also enhanced the moisture stability of devices, thus prolonged the device lifetime. With EDT-Spiro layer, a stabilized power conversion efficiencies from 17.11% up to 19.23% was achieved in the corresponding device. More importantly, a significant enhancement of the long-term stability of PSCs was observed under the N-2 atmosphere without sealing for 30 days.
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