Efficient MA-free perovskite solar cells with balanced carrier transport achieved using 4-trifluorophenylammonium iodide

Abstract

The treatment of 3D perovskite film with 2D perovskite segments has been recognized as a promising approach to improve device performance of perovskite solar cells (PSCs), which has received much...

2D/3D Perovskite: A Step toward Commercialization of Perovskite Solar Cells

“…Li et al prepared 2D/3D perovskite without MA using a novel bulky organic molecule: 4‐trifluorophenylammonium iodide (TFPAI). [ 111 ] In their study, the same measurements and analyses were performed and similar results were obtained, with the ratio of electron‐to‐hole mobility changing from 3.16 to 0.83, while the FF of the final device increased from 76.7% to 82.0%. It should be added here that the electrical properties of 2D/3D heterojunctions will be affected by illumination.…”

Multifunctional Regioisomeric Passivation Strategy for Fabricating Self-Driving, High Detectivity All-Inorganic Perovskite Photodetectors

“…The steady-state photoluminescence (PL), time-resolved photoluminescence (TRPL), and space-charge-limited current (SCLC) were conducted to gain further understanding of defect passivation. As shown in Figure f, the CsPbIBr 2 film treated by 14-FABA exhibits the highest PL intensity and undergoes a noticeable blue-shift compared to both the control and film modified by 13-FABA . In the TRPL (Figure S17 and Table S2), the film modified with 14-FABA exhibited the longest average PL lifetime (τ avg ) of 8.04 ns compared to the control film (6.35 ns) and the film modified by 13-FABA (6.54 ns), indicating the lowest nonradiative recombination.…”

“…As shown in Figure 4f, the CsPbIBr 2 film treated by 14-FABA exhibits the highest PL intensity and undergoes a noticeable blue-shift compared to both the control and film modified by 13-FABA. 38 In the TRPL (Figure S17 and Table S2), the film modified with 14-FABA exhibited the longest average PL lifetime (τ avg ) of 8.04 ns compared to the control film (6.35 ns) and the film modified by 13-FABA (6.54 ns), indicating the lowest nonradiative recombination. From the SCLC (Figure S18), the trap-state density (N d ) and electron mobility (μ e ) of the perovskite films can be quantitatively assessed (as described in Supporting Information) with the electron-only configuration of FTO/SnO 2 /perovskite/PC61BM/Ag devices.…”

“…The strong PL, extended PL lifetime, and low trap-state density of 14-FABA-treated film demonstrate its lowest nonradiative recombination and trap defects and the most effective defect passivation. 38 A series of self-powered perovskite PDs were also fabricated as an illustrative application to demonstrate the FABA passivation effects on the device performance. These PDs, which are constructed with an n-i-p structure of ITO/SnO 2 / CsPbIBr 2 −FABA/P3HT/Ag, are shown in Figure 5a and Experimental Section.…”

“…The decreased response time resulting from defect passivation and improved crystal quality is further supported by the reduced internal series resistance and charge-transfer resistance observed in the Nyquist plots depicted in Figure 5j and Table S4. 38 To further enhance the response time of the devices and broaden their applications, some effective approaches, such as designing and implementing efficient charge transport layers, optimizing interface contact, and designing suitable electrodes could be taken into account to enhance the carrier extraction and collection efficiency. 1 It is found amazingly that the chemical stability in the atmospheric environment is also well enhanced after FABA passivation.…”