Structural effect on triphenylamine dibenzofulvene based interfacial hole transporting materials for high-performance inverted perovskite solar cells

Passivation of Inverted Perovskite Solar Cells by Trifluoromethyl-Group-Modified Triphenylamine Dibenzofulvene Hole Transporting Interfacial Layers

“…From the XRD pattern, there is no characteristic peak of PbI 2 , suggesting the complete conversion of PbI 2 to perovskite . Small organic molecules having Lewis acid–base groups, such as amide, amino, carbonyl, pyridine, and fluorine groups, can repair trap states at the perovskite surface by coordinating with/neutralizing/annihilating the halide anions/undercoordinated Pb 2+ ions. , As can be seen, all the films showed similar patterns, which can be an indication of the completeness of the crystallization of the perovskite films . The defect passivation on the interfacial layers between the HTL and perovskite resulted from the organic layer’s increased hydrophobicity (larger contact angle), proving that the interfacial layers of the trifluoromethyl-based materials promote the growth formation of the perovskite. , The full width at half-maximum (FWHM) of peak (110) was also measured, and the related crystallite size (τ) results were calculated through the Debye–Scherrer equation (τ = k λ/ B cos θ) (Table S4).…”

“…47 Small organic molecules having Lewis acid−base groups, such as amide, amino, carbonyl, pyridine, and fluorine groups, can repair trap states at the perovskite surface by coordinating with/neutralizing/ annihilating the halide anions/undercoordinated Pb 2+ ions. 4,47 As can be seen, all the films showed similar patterns, which can be an indication of the completeness of the crystallization of the perovskite films. 5 The defect passivation on the interfacial layers between the HTL and perovskite resulted from the organic layer's increased hydrophobicity (larger contact angle), proving that the interfacial layers of the trifluoromethyl-based materials promote the growth formation of the perovskite.…”

“…On the basis of prior research on triphenylamine dibenzofulvene derivatives, , in this study, a series of trifluoromethyl substituted triphenylamine dibenzofulvene ( CC-1 – 3 ) were investigated. The synthesis process of the compounds is displayed in Scheme , and the chemical structures of the CC series are shown in Figure .…”

“…From the XRD pattern, there is no characteristic peak of PbI 2 , suggesting the complete conversion of PbI 2 to perovskite. 47 Small organic molecules having Lewis acid−base groups, such as amide, amino, carbonyl, pyridine, and fluorine groups, can repair trap states at the perovskite surface by coordinating with/neutralizing/ annihilating the halide anions/undercoordinated Pb 2+ ions. 4,47 As can be seen, all the films showed similar patterns, which can be an indication of the completeness of the crystallization of the perovskite films.…”

Dibenzofulvene Derivatives as Promising Materials for Photovoltaic and Organic Electronics

“…First of all, this is due to the many advantages of compounds of this type, such as the possibility of modification through many chemical reactions, excellent thermal stability, the high quantum yield of photoluminescence, relatively good features of molecular self-assembly, ambipolar properties of charge transport (holes and electrons), many peculiar features regarding nonlinear optical properties, as well as very good photostability [40,50]. A very interesting variant of the mentioned compounds are dibenzofulvene derivatives (DBFs) (Figure 1) [32][33][34][35][37][38][39][40][41][42][43][44][45][46][48][49][50]. These compounds largely retain the properties of fluorene and its derivatives.…”