Rationally Induced Interfacial Dipole in Planar Heterojunction Perovskite Solar Cells for Reduced J–V Hysteresis

Abstract

With the rapid progress in developing hybrid perovskite solar cells, the allure of current density–voltage ( J–V) hysteresis has attracted quite a lot of interest in the research community. It requires feasible approaches that further deepen the fundamental understanding of device physics in specific device architecture in order to solve this problem eventually. Here, perovskite solar cells configured with different counter electrodes are systematically investigated with the focus on charge accumulation within the devices responsible for J–V hysteresis. The results indicate that J–V hysteresis is affected by charge accumulation which can be modulated by carrier extraction efficiency of the electrodes. Through a rationally induced interfacial dipole, the devices have shown improvement in carrier extraction, which thus reduces J–V hysteresis significantly. It provides solid evidence for the proposition that interface charge plays an important role in J–V hysteresis, and demonstrates an applicable strategy that effectively alleviates J–V hysteresis in perovskite solar cells.

Hole‐Boosted Cu(Cr,M)O2 Nanocrystals for All‐Inorganic CsPbBr3 Perovskite Solar Cells

“…Comparing to sensitized solar cells or silicon solar cells, the efficiency of PSC is always deviated owing to their serious hysteresis effect under forward and back scan conditions (Supporting Information, Figure S11). [33] We note that the optimal CsPbBr 3 PSCs have reduced J-V hysteresis,w hich may be ascribed to the accelerated hole extraction and reduced interfacial charge accumulation. As shown in Figure 2f,t he steady-state power output (SPO) measurement preserves as table power-outputting response of 7.21 %a nd 10.08 %u nder the bias at maximal power point for control and champion devices,r espectively.I ncident photon-tocurrent efficiency (IPCE) spectra are performed to further cross-check the validity of the aforementioned efficiency enhancement (Figure 2g), the integrated photocurrent densities agree well with the results from J-V curves.A dditionally,t he statistical PCE distributions for al arge batch of 10 solar cells in Figure 2h show an increased trend along with tuning CuCrO 2 properties.…”

“…Comparing to sensitized solar cells or silicon solar cells, the efficiency of PSC is always deviated owing to their serious hysteresis effect under forward and back scan conditions (Supporting Information, Figure S11) . We note that the optimal CsPbBr 3 PSCs have reduced J – V hysteresis, which may be ascribed to the accelerated hole extraction and reduced interfacial charge accumulation.…”

Synergistic Coassembly of Highly Wettable and Uniform Hole‐Extraction Monolayers for Scaling‐up Perovskite Solar Cells

“…We further compared the J ‐ V hysteresis of the solar cells, which is widely observed in perovskite solar cells . The inconsistency of the J – V curves in different scan directions is significant decreased after the incorporation of c‐SA as shown in Figure b, probably owing to improved interface charge extraction efficiency . To evaluate the reproducibility of PSCs with and without c‐SA HELs, we fabricated several batches of devices (15 individual cells for each group) and the PCE statistical values are shown in Figure d.…”

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

“…Organic–inorganic lead halide perovskite solar cells (PSCs) have emerged as one of the most promising candidates among next‐generation photovoltaic technologies due to the cost‐effective fabrication process and high photovoltaic performance . Through delicate composition optimization, device architecture innovation, and improvement of interfacial properties, the power conversion efficiency (PCE) of PSCs has surged to over 23% in a short period . Apart from the optimization of the perovskite layer per se, efficient hole and electron extraction from the perovskite layer are equally important in achieving high performance PSCs, especially in the planar architecture .…”