Stability Improvement and Performance Reproducibility Enhancement of Perovskite Solar Cells Following (FA/MA/Cs)PbI_3–xBr_x/(CH₃)₃SPbI₃ Dimensionality Engineering

Abstract

Mixed halide hybrid perovskites are strong candidates for fabrication of efficient, stable and reproducible perovskite solar cells (PSCs). To restrain intrinsic volatility and ionic migration effects, we report for the first time a dimensionality engineering approach consisting of a (FA/MA/Cs)PbI 3−x Br x /(CH 3 ) 3 SPbI 3 (3D/1D) perovskite bilayer architecture, fabricated exclusively with solution processes. XRPD analysis showed no degradation of the 3D/1D composite structure after more than one month of exposure in ambient conditions, in contrast to the reference 3D samples (sole (FA/MA/Cs)PbI 3−x Br x ) which gradually decomposed to PbI 2 . The 3D/1D bilayer structure further optimizes the corresponding absorber/hole transporting layer (HTL) interface of the PSCs, since the (FA/MA/Cs)PbI 3−x Br x perovskite layer acts as the primary absorber and the (CH 3 ) 3 SPbI 3 top layer plays the role of a barrier against ionic migration/charge carrier recombination. The latter leads to a significant stability improvement for nonsealed devices both under ambient conditions and light stress, underscoring the potential of interface engineering for developing highly efficient and stable PSCs based on functional 3D/1D perovskite bilayers.

Improved efficiency of inverted planar perovskite solar cells with an ultrahigh work function doped polymer as an alternative hole transport layer

“…38,73 The hysteresis degrees of the inverted PSCs with different HTLs and CsFAMA perovskite preparation with (FAI + MABr)/IPA treatment were also evaluated using hysteresis index (HI) formula. 74 As can be seen in Table 1, the HI of the PSC devices based on pristine S-P3MEET, S-P3MEET-5% wt PFI, S-P3MEET-10% wt PFI, S-P3MEET-15% wt PFI, and PEDOT:PSS HTLs are 0.0219, 0.0273, 0.0251, 0.0389, and 0.0600, respectively. According to the literature, hysteresis depends largely on carrier transport contact materials, crystal size, and ion migration of the perovskite active layer.…”

Improving the Performance of Carbon-Based Perovskite Solar Modules (70 cm2) by Incorporating Cesium Halide in Mesoporous TiO2

“…Despite the enormous amount of research to achieve an impressive photovoltaic performance in PSCs, the problems of long-term stability and reproducibility factor still prevail, thereby failing to address the market requirements. 67,68 Therefore, in the present study, the fabricated PSCs were subjected to the reproducibility test. A set of 15 devices were fabricated (active area 0.7 cm 2 ) using the same procedure mentioned earlier, and for each layer, the thickness remained constant.…”

Gradient 1D/3D Perovskite Bilayer using 4‐tert‐Butylpyridinium Cation for Efficient and Stable Perovskite Solar Cells

“…[36][37][38][39] The concept of 1D/3D perovskite is promising to improve the PCE and long-term stability. [40][41][42][43] To improve the photovoltaic performance further, a more in-depth understanding of the 1D perovskite layer is needed in terms of crystallography and orientation.…”