Simultaneously Enhanced Efficiency and Stability of Perovskite Solar Cells with TiO₂@CdS Core–Shell Nanorods Electron Transport Layer

Abstract

Both demands of stability and efficiency constitute the gargantuan barriers of perovskite solar cells (PSCs), hampering the academic communities and industrial production. Herein, it is demonstrated that, after depositing optimized CdS shell layers on TiO2 nanorod arrays (NAs) by a simple and rapid chemical bath method at room temperature, the efficiency and stability of PSCs are simultaneously enhanced. The PSCs based on TiO2/CdS core–shell NAs achieve higher power conversion efficiency up to 17.71%, compared to 15.93% of the pristine TiO2 NAs‐based cells. Especially, the stability of the PSCs is prominently improved after optimized CdS layer modification without encapsulation. The significant enhancement of both efficiency and stability are mainly ascribed to that the type‐II structure of TiO2/CdS coaxial nanorods can suppress recombination, and the oxygen vacancies on TiO2 surfaces are not directly contacted with perovskite layers. The surface modification on TiO2 NAs opens up an alternative approach toward improving the performance and stability of PSCs.

Ambient Stable and Efficient Monolithic Tandem Perovskite/PbS Quantum Dots Solar Cells via Surface Passivation and Light Management Strategies

“…[1][2][3][4] Over the past years, extensive efforts in terms of compositional engineering, interface engineering, additive engineering and surface passivation have been devoted to improving the efficiency and stability of the perovskite solar cells (PSCs). [5][6][7][8][9][10] This results in a certified power conversion efficiency (PCE) of 25.5% for single junction device, which is very close to the Shockley-Queisser limit. [11] In order to improve the efficiency and stability of the PSCs, many research groups modified the electron transporting layer/ perovskite interfaces, [12,13] developed new perovskite compositions with improved crystallinity and absorption, [14][15][16] and passivated the surface of perovskite films using different modulators such as chlorine additives [17,18] and 2D perovskites.…”

Perfection of Perovskite Grain Boundary Passivation by Rhodium Incorporation for Efficient and Stable Solar Cells

“…Halide perovskites have attracted great attention owing to the eminent optoelectronic properties, such as suitable energy bandgap [1][2][3][4][5][6], high absorption coefficient [7][8][9], long charge diffusion length [10][11][12][13] and high carrier mobility [14,15]. Those advantages boost the improvement in perovskite solar cells (PSCs), being with certified power conversion efficiency (PCE) up to 25.2% [16].…”

Decoupling Contributions of Charge‐Transport Interlayers to Light‐Induced Degradation of p‐i‐n Perovskite Solar Cells

“…A number of aging pathways have been identified for charge‐transport interlayers, such as spiro‐OMeTAD (hole‐transport layer [HTL]) and TiO x (electron‐transport layer [ETL]) commonly used in n‐i‐p PSCs . Though poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) and SnO 2 were proposed as more stable HTL and ETL, respectively, the PSCs assembled with these materials degrade under exposure to light and heat .…”