期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 50, 期 7, 页码 3962-3971出版社
SPRINGER
DOI: 10.1007/s11664-021-08916-6
关键词
Triphenylamine-based macromolecule; perovskite solar cell; power conversion efficiency; stability
资金
- National Natural Science Foundation of China [U1304212, U2004173]
- Science & Technology Key Project by Education Department of Henan Province [18A480006]
The efficiency and stability of CuSCN-containing perovskite solar cells (PSCs) can be significantly improved by spin-coating triphenylamine-based macromolecules between the CuSCN hole-transporting layer and metallic electrode. The PCE value can reach up to 11.97% with the modification of branched macromolecule CRA-TPA, presenting a nearly two-fold increase compared to the control device.
The CuSCN-containing perovskite solar cells (PSCs) are presently of great research focus due to the high carrier mobility and well-aligned work function of the CuSCN hole-transporting layer. The improvement of photovoltaic performance and stability is still an important subject in the practical applications of CuSCN-containing PSCs. Herein, a facile approach to improve the efficiency and stability of CuSCN-containing PSCs is developed by spin-coating the triphenylamine-based macromolecules between the CuSCN hole-transporting layer and metallic electrode, such as linear macromolecule poly-TPD and branched macromolecule CRA-TPA. The maximum power conversion efficiency (PCE) of CuSCN-containing PSCs is increased by linear triphenylamine-based macromolecule poly-TPD to 10.36% while the PCE value of CuSCN-containing PSCs, being modified by branched triphenylamine-based macromolecule CRA-TPA, reaches up to 11.97%. Evidently, the PCE values are nearly two times higher than 5.95% of CuSCN-containing control device. The photovoltaic improvement of macromolecule-modified CuSCN-containing PSCs is mainly caused by the strong hole-transporting capacity of triphenylamine-based macromolecules inducing the reduction of charge recombination, which is derived from the reduced potential barrier of hole transportation including the flatness and coverage improvement in the triphenylamine-based macromolecular functional layer. In addition, the stability of macromolecule-modified CuSCN-containing PSCs is significantly improved due to the protection of triphenylamine-based macromolecular layer on the perovskite film, so that the unencapsulated macromolecule-modified CuSCN-containing PSC device can keep over 70-80% of initial PCE value after 20-day exposure under ambient environment (relative humidity (RH) = 50%, 25 degrees C). This work provides a facile approach to enhance the efficiency and stability of CuSCN-containing PSCs through the modification of triphenylamine-based macromolecules between the CuSCN hole-transporting layer and metallic electrode. Graphic
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