Abstract
Recently perovskite solar cells (PSCs), as photoelectric conversion devices, exhibit excellent power conversion efficiency (PCE) and low-processing cost, and have become one of the most promising devices to replace conventional silicon-based solar cells and address current pressing energy issues. Among them, the flexible PSCs are especially more widely applicable and may propel the rapid advancements of wearable electronics, causing a significant paradigm shift in consumer electronics. Current flexible PSCs use non-biodegradable petroleum-based polymer substrates, discarding of which will aggravate “white pollution”. Therefore, development of green, biodegradable and low-cost flexible substrates will provide a great alternative to flexible PSCs. Here we have developed transparent nanocellulose paper (NCP) with coating of acrylic resin as substrates to fabricate flexible PSCs, which are biodegradable and easily disposable. The PCE of these NCP-based PSCs reached 4.25%, while the power per weight (the ratio of power to device weight) was as high as 0.56 W g–1. The flexible PSCs also showed good stability, retaining >80% of original efficiency after 50 times of bending. The NCP-based substrates can also be applied to other electronic systems, which may prosper next-generation green flexible electronics.
Highlights
Developing renewable energy sources has become an increasingly urgent task due to the depletion of fossil fuel supply and the growth of energy demand.[1]
Films of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) coated with ITO are most widely used as substrates for flexible perovskite solar cells (PSCs),[7] which are not degraded and may lead to “white pollution”—serious environmental concerns caused by inapposite discarding of petroleumbased polymers.[8]
(2) nanocellulose paper (NCP) was made from viscous solution of nanocellulose
Summary
Developing renewable energy sources has become an increasingly urgent task due to the depletion of fossil fuel supply and the growth of energy demand.[1]. NCP was made from viscous solution of nanocellulose of natural cotton[21] and coated by acrylic resin to form waterproof layer on its surface (step 1–3 of Fig. 1).
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