Minimizing the Voltage Deficit of Tin Halide Perovskite Solar Cells with Hydroxyurea‐Doped PEDOT:PSS

Abstract

Tin halide perovskite solar cells (TPSCs) have made great strides recently with an inverted device structure, in with poly(3,4‐ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) has been already widely applied as the hole transport layer (HTL) due to its optical transparency, easy processability, and good mechanical expandability. Nevertheless, the TPSCs still suffer from a severe voltage deficit from the carrier recombination loss and energy‐level mismatch. Herein, hydroxyurea (HYU)‐doped PEDOT:PSS to suppress the voltage loss at the PEDOT:PSS/perovskite interface is applied. It has been revealed that HYU effectively tunes the conductivity and hole mobility of PEDOT:PSS. The interfacial nonradiative carrier recombination is effectively suppressed. The target device shows a 20% increase in the open‐circuit voltage together with an increased power conversion efficiency rising from 8.10% to 10.17%. Therefore, this work provides a feasible strategy to minimize the voltage deficit in TPSCs from the HTL side, which is highly important to further boost the performance of TPSCs.

Nonfullerene Agent Enables Efficient and Stable Tin‐Based Perovskite Solar Cells

“…Furthermore, electrochemical impedance spectroscopy (EIS) was used to analyze the carrier recombination process of control and IO‐4Cl‐based devices. [ 37 ] The EIS measurements were taken under dark conditions at the bias of 0.45 and 0.55 V, respectively (Figure 5c). The Nyquist plots of the control and IO‐4Cl‐treated devices exhibit different single semicircles, which are related to charge recombination resistance values ( R rec ).…”

Structure Influence of Amine‐Containing Additives on the Solution State and Out‐of‐Plane Conductivity of PEDOT:PSS for Efficient Organic Solar Cells

“…This observation is on par with reported values. [ 26 ] The high anisotropy in electric conductivity is likely due to the highly conductive PEDOT chains mostly lies in‐plane, highlighting the sensitivity of PEDOT:PSS conductivities on molecular conformation. The possible influence of the increased out‐of‐plane conductivity of the HTLs on PM6:L8‐BO based devices was monitored by conducting impedance measurement in alternating current mode.…”

Application of arginine-doped PEDOT:PSS as a hole transfer layer in perovskite solar cells

“…20–23 These drawbacks hinder the enhancement of the photovoltaic performance and environmental stability of inverted PSCs based on PEDOT:PSS as the HTL, thus impeding their commercial production. 24–27…”

“…[20][21][22][23] These drawbacks hinder the enhancement of the photovoltaic performance and environmental stability of inverted PSCs based on PEDOT:PSS as the HTL, thus impeding their commercial production. [24][25][26][27] Recently, many researchers have optimized PEDOT:PSS to make it more suitable as a HTL in PSCs. For example, Kim and Mochizuki et al 28,29 introduced NaOH into the PEDOT:PSS solution.…”