Hydrophobic Fluorinated Conjugated Polymer as a Multifunctional Interlayer for High-Performance Perovskite Solar Cells

Abstract

It is known that the perovskite/hole transport layer (HTL) interface is a great limit to achieving high-performance perovskite solar cells (PSCs). Aiming to solve this problem, we introduce a naphthalene diimide (NDI)-based conjugated polymer bearing 3,4-difluorothiophene (PTzNDI-2FT) at the perovskite/HTL interface. We find that the PTzNDI-2FT interlayer combines multifunctions to passivate surface defects on the perovskite film, improve charge transport at the perovskite/HTL interface, and prevent penetration of the moisture and organic ion volatilization in the perovskite film. The champion device exhibits a power conversion efficiency of 23.2% under standard AM 1.5 G one sun illumination and offers excellent environmental, heat, and light stabilities.

Polymerizable Ammonium Salt Interlayer for Efficient and Stable NiOx-Based Perovskite Solar Cells

“…In addition, bright regions representing high current signals are widely distributed, and there is a penetrating phenomenon between some regions. The above results indicate that CTBAI modification enhances the surface conductivity of the perovskite film on NiO x substrate, thus facilitating charge extraction and transmission . Moreover, the defect density of the perovskite was further quantitatively analyzed by a space charge limited current (SCLC) method.…”

“…The above results indicate that CTBAI modification enhances the surface conductivity of the perovskite film on NiO x substrate, thus facilitating charge extraction and transmission. 25 Moreover, the defect density of the perovskite was further quantitatively analyzed by a space charge limited current (SCLC) method. The pure hole device structure is ITO/NiO x /CTBAI layer/perovskite/PTAA/Au.…”

Enhancing operational stability in perovskite solar cells by solvent-free encapsulation method

“…To overcome these external instabilities, great effort has been made, such as taking advance of the hydrophobic character of some polymers, 11 tune perovskite compositions, [12][13][14] passivation layers [15][16][17] or novel hole transporter materials (HTM). 18,19 For instance, Li et al 20 deposited a naphthalene diimide (NDI)-based conjugated polymer bearing 3,4-diuorothiophene (PTzNDI-2FT) between the perovskite and HTL. This strategy not only resulted in a high PCE of 23.2% but also performance retention of 97% aer 3000 h in 5-10% RH.…”

Multifunctional Ionic Liquid as an Interfacial Modifier for High-Performance and Stable NiOx-Based Inverted Perovskite Solar Cells

“…Hence, the EMIMAE modification can improve the air-moisture stability of both NiO x and perovskite films. 28 UV−vis absorbance spectra were applied to record the perovskite film aging. Each aging condition: the perovskite film was first placed at ambient atmosphere for 10 d and then heated on a hot plate (100 °C) for 2 h. Figure 6e shows that, under initial conditions, EMIMAE modification has no significant effect on the UV−vis absorption of films.…”

“…Due to the existence of a hydrophobic aromatic nucleus in the EMIMAE molecule, the film hydrophobicity has been improved. Hence, the EMIMAE modification can improve the air-moisture stability of both NiO x and perovskite films . UV–vis absorbance spectra were applied to record the perovskite film aging.…”