Simultaneous Interfacial Modification and Defect Passivation for Wide‐Bandgap Semitransparent Perovskite Solar Cells with 14.4% Power Conversion Efficiency and 38% Average Visible Transmittance

Abstract

Perovskite materials offer a great potential in the application of semitransparent solar cells, owing to the tunable bandgap, ease of preparation and excellent photovoltaic property. A majority of works exhibit high average visible‐light transmittance (AVT) for semitransparent perovskite solar cells (ST‐PSCs) through decreasing perovskite thickness, leading to sacrificing the power conversion efficiency (PCE) of the device. Herein, a wide‐bandgap (WBG) perovskite of Cs0.2FA0.8Pb(I0.6Br0.4)3 is applied as absorber in ST‐PSCs, which is a tremendous progress to balance both large PCE and high AVT. Moreover, a strategy of simultaneous interfacial modification and defect passivation is provided to enhance the performance of WBG ST‐PSCs. Consequently, an inverted planar structure WBG perovskite solar cell (PSC) achieves 15.06% of PCE with excellent stability by restraining the interfacial energy loss and suppressing the nonradiative recombination. Furthermore, the ST‐PSC obtains high PCE of 14.40% with an AVT of 38% by means of optimizing the transparent electrode. This work provides an efficient and simple method to improve the performance and AVT of ST‐PSCs for the application in building‐integrated photovoltaics.

Engineering the intermediate adduct phase to control the crystallization of perovskites for efficient and stable perovskite solar cells

“…The film with the optimized FAI concentration (20 mg mL −1 ) was more homogeneous among all. 36,43,44 These microscale measurements of morphological smoothness and uniformity indicate the optimized number of molecular exchanges at an optimal quantity of FAI in the IPA. As a result, it considerably improved the final morphology of the perovskite film.…”

Innovative Approaches to Semi-Transparent Perovskite Solar Cells

“…On a similar note, in recent reports, Shi et al tried to overcome the problem between efficiency and transmittance by utilizing a wide band-gap (WBG) perovskite absorber with a composition of Cs 0.2 FA 0.8 Pb(I 0.6 Br 0.4 ) 3 [ 25 ]. The perovskite with different concentrations varying from 0.2 to 1 M were prepared with a balance between iodine and bromine concentrations to maintain a balance between AVT and efficiency ( Figure 1 a,b).…”

“…( g ) Schematic of device architecture and 2-Hydroxyethyl cellulose molecular structure and a sketch of MAPbI 3 . ( h ) Interrelation between PCE and AVT for ST-PSCs with different precursor concentrations [ 21 , 25 , 28 , 30 , 31 , 33 , 34 , 39 , 40 , 41 , 42 , 43 ]. Reprinted with permission from Refs.…”

“…The devices showed a PCE of 13.45% after TPR treatment, signifying the capability for the development of ST-PSCs for window applications. The compiled graph ( Figure 2 h) [ 21 , 25 , 28 , 30 , 31 , 33 , 34 , 39 , 40 , 41 , 42 , 43 ] depicts the PCE and AVT graph for an ST-PSC modified with different perovskite precursors. The graph clearly indicates the trade-off relationship between PCE and transmittance.…”

Enhancing the Photovoltaic Performance of Perovskite Solar Cells by Doping 2-mercaptoimidazole in the Active Layer

“…5,6 These defects seriously affect carrier transport by forming non-radiative recombination centers, thereby reducing the efficiency of PSCs. 7 On the other hand, moisture and oxygen in the environment can penetrate into the film and react with defects, and the resulting degradation of perovskite is an important factor affecting the commercialization of PSCs. 8 Additive engineering is an important passivation method for reducing defects in perovskites, which can well improve the overall performance of PSCs.…”