Constructing Efficient and Stable Perovskite Solar Cells via Interconnecting Perovskite Grains

Abstract

A high-quality perovskite film with interconnected perovskite grains was obtained by incorporating terephthalic acid (TPA) additive into the perovskite precursor solution. The presence of TPA changed the crystallization kinetics of the perovskite film and promoted lateral growth of grains in the vicinity of crystal boundaries. As a result, sheet-shaped perovskite was formed and covered onto the bottom grains, which made some adjacent grains partly merge together to form grains-interconnected perovskite film. Perovskite solar cells (PSCs) with TPA additive exhibited a power conversion efficiency (PCE) of 18.51% with less hysteresis, which is obviously higher than that of pristine cells (15.53%). PSCs without and with TPA additive retain 18 and 51% of the initial PCE value, respectively, aging for 35 days exposed to relative humidity 30% in air without encapsulation. Furthermore, MAPbI film with TPA additive shows superior thermal stability to the pristine one under 100 °C baking. The results indicate that the presence of TPA in perovskite film can greatly improve the performance of PSCs as well as their moisture resistance and thermal stability.

Stabilization of Inorganic CsPb0.5Sn0.5I2Br Perovskite Compounds by Antioxidant Tea Polyphenol

“…As shown in Figure b, the vibrational band C═O ( V (C═O)) and asymmetrical stretching vibration V as (C—O) of the ester group in the TP at 1617 and 1146 cm −1 shifted to 1602 and 1140 cm −1 in the TP/CsPb 0.5 Sn 0.5 I 2 Br complex sample, respectively. This can be attributed by the coordination interaction between the ester group from TP and Sn 2+ , Pb 2+ from perovskite compound by sharing the lone electron pair . In addition, the symmetrical stretching vibration band —COO— ( V s (C—O—C)) of the ester group at 1240 cm −1 disappeared in the complex sample, which further confirms the coordination interaction between TP and Sn 2+ , Pb 2+ which is shown in Figure c.…”

“…This can be attributed by the coordination interaction between the ester group from TP and Sn 2þ , Pb 2þ from perovskite compound by sharing the lone electron pair. [44] In addition, the symmetrical stretching vibration band -COO-(V s (C-O-C)) of the ester group at 1240 cm À1 disappeared in the complex sample, which further confirms the coordination interaction between TP and Sn 2þ , Pb 2þ which is shown in Figure 3c. The in-plane blending vibration of -OH (V(-OH)) at 1315 cm À1 in TP shifted to a higher wavenumber at 1335 cm À1 , which provides direct evidence for the antioxidation of the reducing hydroxyl functional groups in TP.…”

Retarding Thermal Degradation in Hybrid Perovskites by Ionic Liquid Additives

“…However, improved stability is often related to the increased moisture resistance under humid environments, similarly to employing an extra “blocking layer” to protect the film from moisture. To the best of our knowledge, there are no investigations that specifically target the thermal stability of the material, and studies that mention thermal stabilization either do not report stability tests or, if reported, the tests are often performed under arbitrary conditions, i.e., devices stored under dark conditions, without continuous light illumination, bias or at undefined (or low, ≈25 °C) temperatures, and even include very poor performance or extremely short testing times (≤50 h) . As a consequence, a comparison among the different strategies becomes extremely challenging.…”

Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

“…[29] We used dark current and electrochemical impedance spectroscopy (EIS) under dark conditions to evaluate the charge carrier recombination resistance (R rec ) of the devices. A semicircle in the intermediatefrequency region is associated with charge recombination at interfaces [30] between the active layer and NiO x . The larger arc of this semicircle for the DMA0.11 device (Figure 5b) indicates a large recombination resistance, consistent with the view that car-Adv.…”