Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Printable hole-conductor-free perovskite solar cells (PSCs) have attracted intensive research attention due to their high stability and simple manufacturing process. However, the cells have suffered severe potential loss in the absence of the hole transporting layer. The dimensionality of the perovskite absorber in the mesoporous carbon electrodes by conducting post-treatments is reduced. The low-dimensional perovskites possess wide-bandgaps and form type-II band alignment, favoring directional charge transportation and thus enhancing the device performance. For the cells using MAPbI3 (MA = methylammonium) as the light absorber, the open-circuit voltage (VOC) is significantly enhanced from 0.92 to 0.98 V after posttreatment, delivering an overall efficiency of 16.24%. For the cells based on FAPbI3 (FA = formamadinium), a high efficiency of 17.47% is achieved with VOC of 1.02 V, which are both the highest reported values for printable hole-conductor-free PSCs. This strategy provides a facile method for tuning the energy level alignment for mesoscopic perovskite-based optoelectronics.
The authors acknowledge financial support from the National Natural
Science Foundation of China (Grant Nos. 91733301, 22075094,
11904266, and 21702069), the Fundamental Research Funds for the
Central Universities, the Science and Technology Department of Hubei
Province (No. 2017AAA190), the 111 Project (No. B07038), the Program
for HUST Academic Frontier Youth Team (2016QYTD06), the Open
Project Program of Wuhan National Laboratory for Optoelectronics
NO. 2020WNLOKF014, and the Program Management Unit for Human
Resources & Institutional Development, Research and Innovation (Grant
number B05F630113). The authors thank the Analytical and Testing
Center of Huazhong University of Science and Technology (HUST) for
performing various characterization and measurements.
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