Functional inorganic selective contact layers for perovskite solar cell application
Pei-Ying Lin a, Ming-Hsien Li a, Yu-Hsien Chiang a, Po-Shen Shen a, Peter Chen a b c
a Department of Photonics, National Cheng Kung University, 70101 Tainan, Taiwan, ROC
b Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, 70101 Tainan, Taiwan, ROC
c Center for Micro/Nano Science and Technology (CMNST), National Cheng Kung University, 70101 Tainan, Taiwan, ROC
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Oral, Pei-Ying Lin, presentation 067
Publication date: 23rd October 2018

The organic–inorganic hybrid organometal halide perovskites achieved a remarkable power conversion efficiency (PCE) of 22.1% in less than five years due to their superior photonic properties, and facile solution-processed fabrication of active layer perovskite. In this report, we successfully demonstrated the efficient perovskite solar cells with all-inorganic metal oxide as selective contact layers. For the p-i-n structure, we employed microwave-assisted solution process to synthesize metal oxide particles for inorganic selective contacts. The perovskite solar cells fabricated with mesoporous nickel oxide (NiO) and as-synthesized metal oxides (IZO, IGZO) as hole-transporting layer (HTL) and electron-transporting layer (ETL), respectively. Using IZO to replace C60 and PCBM can solve the stability issue of fullerene (derivative) degeneration and their reaction with bottom electrode or perovskite layer. The IZO-based perovskite solar cells demonstrate a PCE of over 16% and impressive long-term stability under air or light-soaking conditions. With encapsulation, our device retained 85% of the initial power conversion efficiency after 460 hours of light soaking. For the n-i-p structure, a recyclable monolithic substrate applying metal oxide selective contact with a nanoporous (np) Au:NiOx counter electrode is successfully demonstrated for efficient perovskite solar cells, of which the perovskite active layer is deposited in the final step for device fabrication. Through annealing of the Ni/Au bilayer, the nanoporous NiO/Au electrode is formed in virtue of interconnected Au network embedded in oxidized Ni. With mp-TiO2/mp-Al2O3/np-Au:NiOx as a template, the original perovskite solar cell with PCE of 10.25% can be rejuvenated by rinsing off the perovskite material with dimethylformamide (DMF) and refilling with newly deposited perovskite. The application of all-inorganic metal oxide selective contacts for both p-i-n and n-i-p structure has potential for commercializing cost-effective mass production.

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