Dual Interfacial Modifications Enable High Performance Semitransparent Perovskite Solar Cells with Large Open Circuit Voltage and Fill Factor

Abstract

In this work, both anode and cathode interfaces of p‐i‐n CH3NH3PbI3 perovskite solar cells (PVSCs) are simultaneously modified to achieve large open‐circuit voltage (Voc) and fill factor (FF) for high performance semitransparent PVSCs (ST‐PVSCs). At the anode, modified NiO serves as an efficient hole transport layer with appropriate surface property to promote the formation of smooth perovskite film with high coverage. At the cathode, a fullerene bisadduct, C60(CH2)(Ind), with a shallow lowest unoccupied molecular orbital level, is introduced to replace the commonly used phenyl‐C61‐butyric acid methyl ester (PCBM) as an alternative electron transport layer in PVSCs for better energy level matching with the conduction band of the perovskite layer. Therefore, the Voc, FF and power conversion efficiency (PCE) of the PVSCs increase from 1.05 V, 0.74 and 16.2% to 1.13 V, 0.80 and 18.1% when the PCBM is replaced by C60(CH2)(Ind). With the advantages of high Voc and FF, ST‐PVSCs are also fabricated using an ultrathin transparent Ag as cathode, showing an encouraging PCEs of 12.6% with corresponding average visible transmittance (AVT) over 20%. These are the highest PCEs reported for ST‐PVSCs with similar AVTs paving the way for using ST‐PVSCs as power generating windows.

Inorganic CsPbI2Br Perovskite Solar Cells: The Progress and Perspective

“…The charge carrier loss happens when there is a mismatch in energy levels between the perovskite film and ETL or HTL . Thus, synergic optimization of the device interface is of great urgency to reduce recombination loss and improve charge collection toward highly efficient CsPbI 2 Br PSCs.…”

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

“…[31] Similar results were also obtained by Yip and co-workers when they applied the DEA modification on a low-temperature NiO film. [117] Seok and co-workers reported a pulsed laser deposited NiO film with favorable orientation to adjust the exposure surface of NiO at the NiO/perovskite interface, resulting in a facilitated hole extraction from perovskite to NiO. [39] Han and co-workers doped the NiO with Li and Mg to adjust the conductivity and work function of NiO HTM, which helped to form an Ohmic contact at the FTO/ perovskite interface due to the decreasing of barrier height.…”

Highly Efficient Sn–Pb Perovskite Solar Cell and High‐Performance All‐Perovskite Four‐Terminal Tandem Solar Cell

“…The faster the TPC decay, the better the charge extraction. TPV is a direct way to monitor the dynamic change of excess carrier recombination in solar cells due to its open circuit connection . The slower the TPV decay, the longer the lifetime of excess carriers.…”