Journal
ADVANCED MATERIALS
Volume 30, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201803735
Keywords
aldehydes; aniline; enamine; perovskite solar cells; semiconductors
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Funding
- European Union's Horizon 2020 research and innovation programme of the PerTPV project [763977]
- Research Council of Lithuania [MIP-17-70]
- European Social Fund [09.3.3.-LMT-K-712-03-0038]
- AFOSR [FA9550-15-1-0115]
- EPSRC [EP/M024881/1, EP/M015254/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M024881/1, EP/M015254/1] Funding Source: researchfish
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Metal-halide perovskites offer great potential to realize low-cost and flexible next-generation solar cells. Low-temperature-processed organic hole-transporting layers play an important role in advancing device efficiencies and stabilities. Inexpensive and stable hole-transporting materials (HTMs) are highly desirable toward the scaling up of perovskite solar cells (PSCs). Here, a new group of aniline-based enamine HTMs obtained via a one-step synthesis procedure is reported, without using a transition metal catalyst, from very common and inexpensive aniline precursors. This results in a material cost reduction to less than 1/5 of that for the archetypal spiro-OMeTAD. PSCs using an enamine V1091 HTM exhibit a champion power conversion efficiency of over 20%. Importantly, the unsealed devices with V1091 retain 96% of their original efficiency after storage in ambient air, with a relative humidity of 45% for over 800 h, while the devices fabricated using spiro-OMeTAD dropped down to 42% of their original efficiency after aging. Additionally, these materials can be processed via both solution and vacuum processes, which is believed to open up new possibilities for interlayers used in large-area all perovskite tandem cells, as well as many other optoelectronic device applications.
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