Self-assembly monomolecular engineering towards efficient and stable inverted perovskite solar cells

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 430; p. 132986
• Main Authors: Huang, Shuai, Liu, Ziyang, Xu, Jie, Zhang, Dongdong, Dong, Hua, Wu, Zhaoxin, Duan, Lian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-02-2022
• Subjects: Energy level matching; Perovskite solar cells; Reorganization energies; Triphenylamine derivatives; Triphenylamine derivatives; Perovskite solar cells; Energy level matching; Reorganization energies
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.132986

Highly-efficient and stable hole-transport-layer-free perovskite solar cells with monolayer D-o-D type triphenylamine derivatives for hole-extraction are developed.
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•D-o-D type triphenylamine derivatives with sp3 oxygen are proposed.•The optimized molecular is introduced to the efficient PSCs.•The designed molecules ameliorate the device photovoltaic performance.•The hysteresis behavior and device stability are greatly improved.
Perovskite solar cells (PSCs) with monolayer-modified anodes are promising for high efficiency and stability devices with simplified configuration. Though preliminary studies on modified anodes by small organic molecules were reported, the goal-directed design and regulation of such compounds have been sparsely reported so far, thus limiting device performances. Herein, D-o-D type triphenylamine derivatives with non-conjugated linkage of sp3 oxygen are proposed to finely tune the energy level alignment and enhance the defect passivation at the ITO/perovskite interface, thus facilitating the efficient charge extraction at the anodes. The optimized molecules considerably ameliorate the photovoltaic performances of the corresponding inverted PSCs, engendering a preeminent power-conversion-efficiency (PCE) of 20.57% with negligible hysteresis. Remarkably, a good long-term stability is recorded for the unencapsulated device with over 94% of the initial PCE maintained after 180 days storage in N2 condition. Those improved performances validate the feasibility of the D-o-D molecules for cost-effective PSCs with high-efficiency, and excellent long-term stability.