Journal
ADVANCED MATERIALS
Volume 33, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202006753
Keywords
energy disorder; high mobility; hole transport; molecular packing; p– i– n planar perovskite solar cells
Categories
Funding
- National Natural Science Foundation of China [51922074, 51820105003, 22075194]
- National Key Research and Development Program of China [2020YFB1506400]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- National Postdoctoral Program for Innovative Talents [BX20200231]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Research Opportunity Initiative grant
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The study introduces a charge-transfer complex (CTC) strategy to reduce energy disorder in organic semiconductor charge-transport layers (OS-CTLs) and enhance the performance of p-i-n planar perovskite solar cells (pero-SCs).
Solution-processed organic semiconductor charge-transport layers (OS-CTLs) with high mobility, low trap density, and energy level alignment have dominated the important progress in p-i-n planar perovskite solar cells (pero-SCs). Unfortunately, their inevitable long chains result in weak molecular stacking, which is likely to generate high energy disorder and deteriorate the charge-transport ability of OS-CTLs. Here, a charge-transfer complex (CTC) strategy to reduce the energy disorder in the OS-CTLs by doping an organic semiconductor, 4,4 '-(4,8-bis(5-(trimethylsilyl)thiophen-2-yl)benzo[1,2-b:4,5-b ']dithiophene-2,6-diyl)bis(N,N-bis(4-methoxyphenyl)aniline) (BDT-Si), in a commercial hole-transport layer (HTL), poly[bis(4-phenyl) (2,4,6-trimethylphenyl)amine (PTAA), is proposed. The formation of the CTC makes the PTAA conjugated backbone electron-deficient, resulting in a quinoidal and stiffer character, which is likely to planarize the PTAA backbone and enhance the ordering of the film in nanoscale. The resultant HTL exhibits a reduced energy disorder, which simultaneously promotes hole transport in the HTL, hole extraction at the interface, energy level alignment, and quasi-Fermi level splitting in the device. As a result, the p-i-n planar pero-SCs with optimized HTL exhibit the best power conversion efficiency of 21.87% with good operating stability. This finding demonstrates that the CTC strategy is an effective way to reduce the energy disorder in HTLs and to improve the performance of planar pero-SCs.
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