Journal
SCIENCE CHINA-CHEMISTRY
Volume 63, Issue 7, Pages 987-996Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-020-9741-1
Keywords
hole-transporting materials; supramolecular interactions; reverse diffusion; p-i-n planar perovskite solar cells
Categories
Funding
- National Natural Science Foundation of China [51922074, 51673138, 51820105003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18 2496]
- Tang Scholar
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Collaborative Innovation Center for New-type Urbanization and Social Governance of Jiangsu Province
- National Key Research and Development Program 376 of China [2017YFA0207700]
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The rational design of dopant-free organic hole-transporting layer (HTL) materials is still a challenge for realizing high-efficient and stable p-i-n planar perovskite solar cells (pero-SCs). Here, we synthesized two pi-conjugated small-molecule HTL materials through tailoring the backbone and conjugated side chain to carefully control molecular conformation. The resultant BDT-TPA-sTh containing a planar fused benzo[1,2-b:4,5-b ']dithiophene (BDT) core and a conjugated thiophene side chain showed the planar conformation. X-ray crystallography showed a favorable stacking model in solid states under the parallel-displaced pi-pi and additional S-pi weak-bond supramolecular interactions, thus achieving an obviously increased hole mobility without dopants. As an HTL material in p-i-n planar pero-SCs, the marginal solubility of BDT-TPA-sTh enabled inverse diffusion into the perovskite precursor solution for assisting the subsequent perovskite film growth and passivating the uncoordinated Pb2+ ion defects. As a result, the planar p-i-n pero-SCs exhibited a champion power conversion efficiency (PCE) of 20.5% and enhanced moisture stability. Importantly, the BDT-TPA-sTh HTL material also showed weak thickness-photovoltaic dependence, and the pero-SCs with blade-coated BDT-TPA-sTh as a HTL achieved a 15.30% PCE for the 1-cm(2) modularized device. This HTL material design strategy is expected to pave the way toward high-performance, dopant-free and printing large-area planar p-i-n pero-SCs.
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