Pitfalls and prospects of optical spectroscopy to characterize perovskite-transport layer interfaces

Abstract

Perovskite photovoltaics has witnessed an unprecedented increase in power conversion efficiency over the last decade. The choice of transport layers, through which photo-generated electrons and holes are transported to the electrodes, is a crucial factor for further improving both the device performance and stability. In this perspective, we critically examine the application of optical spectroscopy to characterize the quality of the transport layer-perovskite interface. We highlight the power of complementary studies that use both continuous wave (cw) and time-resolved photoluminescence (PL) to understand non-radiative losses, and additional transient spectroscopies for characterizing the potential for loss-less carrier extraction at the solar cell interfaces. Based on this discussion, we make recommendations on how to extrapolate results from optical measurements to assess the quality of a transport layer, and its impact on solar cell efficiency.

References in corpus (5)

• Intense Internal and External Fluorescence as Solar Cells Approach the Shockley-Queisser Efficiency Limit
• The perovskite/transport layer interfaces dominate non-radiative recombination in efficient perovskite solar cells
• Solar Energy Conversion and the Shockley-Queisser Model, a Guide for the Perplexed
• Carrier-Resolved Photo Hall Measurement in World-Record-Quality Perovskite and Kesterite Solar Absorbers
• Can we use time-resolved measurements to get Steady-State Transport data for Halide perovskites?

Cited by in corpus (2)

• Interface Modification for Energy Levels Alignment and Charge Extraction in CsPbI${}_3$ Perovskite Solar Cells
• Distinguishing Carrier Transport and Interfacial Recombination at Perovskite-Transport Layer Interfaces Using Ultrafast Spectroscopy and Numerical Simulation