No abstract

Carbon‐electrode‐based perovskite solar cells (C‐PSCs) are promising candidates for commercialization due to their high stability. However, the absence of a hole selective layer (HSL) often limits their performance, yielding low fill factors (FFs). Herein, a certified FF of 78.8% obtained through HSL‐free C‐PSCs is focused. This is found to approach the highest values reported for metal‐electrode‐based PSCs employing highly selective HSLs. The loss mechanisms affecting the FF in fully printed HSL‐free C‐PSCs are thus investigated. Methods commonly used to analyze and quantify the impact of recombination and transport losses on the FF of established photovoltage devices are assessed, and their applicability in C‐PSCs is examined. In the improved devices, non‐radiative recombination contributes to only 3%abs loss with respect to the FF in the radiative limit, which is attributed to an optimal diode ideality factor approaching 1.0. Moreover, contributions of shunt resistive losses are determined to be negligible. Interfacial series resistance losses at the perovskite/carbon interface are identified as the main loss channel, highlighting the importance of the quality of the contact between the perovskite and the back‐contact electrode.

No abstract

Variations in the time courses of the activation of fully-printable carbon-based multi-porous-layered-electrode perovskite solar cells (MPLE-PSCs) can lead to differences between the photocurrent density (J sc ) values obtained from one-sun photocurrent densityvoltage (J-V ) measurements and from incident-photon-to-current efficiency (IPCE) integration when using monochromic light. In the present work, the J sc calculated from IPCE data was initially equal to half that obtained from one-sun J-V measurements. However, equivalent values were obtained when the J-V measurements were performed after 10 min of irradiation by a white light LED from the side of the device. This finding will be very important with regard to permitting accurate photovoltaic evaluation of MPLE-PSCs in the future.