Simplified Compact Perovskite Solar Cells with Efficiency of 19.6% via Interface Engineering

Abstract

For the commercialization of perovskite solar cells (PSCs), it is more appealing to develop high‐performance simplified PSCs where perovskite films are just sandwiched between the back and front electrodes, in order to simplify the fabrication process and to reduce the cost. However, to date, this kind of devices shows rather low performance, and there are few researches on this subject. Herein, we report on a kind of compact PSCs (CPSCs) that are free of independent charge transport layers (CTLs). The devices are realized by the use of organic monolayer‐modified effective electrodes, along with the use of [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM)‐assisted anti‐solvent technique to obtain ultra‐thin (~10 nm) PCBM‐embedded perovskite films. Compared to control devices, CPSCs achieve a promising champion power conversion efficiency of 19.6% with largely reduced hysteresis. Moreover, the unencapsulated CPSC shows good stability under ambient atmosphere, with only 10% efficiency loss after 60 days’ storage. This work indicates that, by delicate design, CPSCs with smaller materials consumption in device architecture can perform competitively as conventional PSCs. Further reduction in the actual usage of costly CTL materials can be expected upon our CPSCs by developing more facile and economic methods to prepare ultra‐thin CTLs.

Mitigation of vacancy with ammonium salt-trapped ZIF-8 capsules for stable perovskite solar cells through simultaneous compensation and loss inhibition

“…[1][2][3][4][5][6] Mainly benefiting from the great efforts on engineering of the device structure, solvent, composition, additive, and interface, PCEs of PSCs were strikingly enhanced from the original 3.8% to the presently certified 25.5% within only several years. [7][8][9][10][11][12][13][14][15] However, in state-of-the-art PSCs, there exists significant non-radiative loss in perovskite absorber, which mainly originates from ionic defect states such as MA + or FA + vacancies, limiting further improvement of the device performance. [16][17][18] And simultaneously, those vacancies are believed as the attack target by external environment, such as moisture, heat or light, inducing perovskite degradation and device instability.…”

Reversible Release and Fixation of Bromine in Vacancy‐Ordered Bromide Perovskites

“…Metal halide perovskites, with the general chemical formula ABX 3 (A is a small cation such as Cs + , B is a divalent cation such as Pb 2+ , and X is a halogen anion), have undergone a surge in popularity due to their superior photovoltaic properties since 2009. [30][31][32][33][34][35][36][37] Subsequently, the other optoelectronic applications of halide perovskites have also been well developed, such as lightemitting diodes [38][39][40][41] and radiation detectors. [42][43][44] At the meantime, the halide perovskite analogs have been greatly enriched, [45,46] including halide double perovskites and quadruple perovskites.…”

Poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) Modified by Water for Efficient Inverted Perovskite Solar Cells

“…The improved charge transport and extraction will benefit the reduction of the nonradiation combination loss and enhance the performance of the devices. [1,41] To further explore the reasons for the improved device performance, the J-V characteristic of the devices was analyzed by Equation (1). [42] J wherein J represents the current density through the external load, J sc is the light-induced constant current density, A is the ideal factor, R s is the series resistance, R sh is the parallel resistance, e is the element charge, and T is the Kelvin temperature.…”

“…The improved charge transport and extraction will benefit the reduction of the nonradiation combination loss and enhance the performance of the devices. [ 1,41 ]…”