Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201904300
Keywords
device engineering; dopant-free; hole transport material; perovskite solar cell
Categories
Funding
- National Natural Science Foundation of China [51573077, 21875111, 51861145401]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- China Scholarship Council (CSC) [201706840039]
- Air Force Research Laboratory [FA9453-18-2-0037]
- Office of Naval Research [N00014-17-1-2223]
- Ohio Research Scholar Program
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Dopant-free hole transport materials (HTMs) are essential for commercialization of perovskite solar cells (PSCs). However, power conversion efficiencies (PCEs) of the state-of-the-art PSCs with small molecule dopant-free HTMs are below 20%. Herein, a simple dithieno[3,2-b:2 ',3 '-d]pyrrol-cored small molecule, DTP-C6Th, is reported as a promising dopant-free HTM. Compared with commonly used spiro-OMeTAD, DTP-C6Th exhibits a similar energy level, a better hole mobility of 4.18 x 10(-4) cm(2) V-1 s(-1), and more efficient hole extraction, enabling efficient and stable PSCs with a dopant-free HTM. With the addition of an ultrathin poly(methyl methacrylate) passivation layer and properly tuning the composition of the perovskite absorber layer, a champion PCE of 21.04% is achieved, which is the highest value for small molecule dopant-free HTM based PSCs to date. Additionally, PSCs using the DTP-C6Th HTM exhibit significantly improved long-term stability compared with the conventional cells with the metal additive doped spiro-OMeTAD HTM. Therefore, this work provides a new candidate and effective device engineering strategy for achieving high PCEs with dopant-free HTMs.
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