Mitigating interfacial and bulk defects via chlorine modulation for HTL-free all-inorganic CsPbI2Br carbon-based perovskite solar cells with efficiency over 14%

Surface Passivation of CsPbI 3 Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

“…But for the commercial application of PSCs, long-term stability is as equally important as device efficiency. Till now, highly efficient PSCs are based on organic–inorganic hybrid perovskites, which consist of thermolabile organic cations (e.g., methylammonium (MA), formamidinium (FA)), hindering their further development for commercialization. − To address this issue, inorganic perovskites employing Cs + as an A-site cation are developed, which have been demonstrated to be an efficient component for constructing highly efficient PSCs. − Among all of the reported inorganic perovskites, the CsPbI 3 perovskite possesses a suitable band gap ( E g : ∼1.7 eV) as well as decent phase stability and is considered as the most promising candidate for commercial application. − Actually, the PCE of the best-performing CsPbI 3 -based PSCs has exceeded 21% and is in a rapid growth stage currently. , …”

Preparation of High-Efficiency (>14%) HTL-Free Carbon-Based All-Inorganic Perovskite Solar Cells by Passivation with PABr Derivatives

“…For more insight into the influence of passivation on carrier recombination dynamics and carrier transport, steady-state photoluminescence (PL) and time-resolved photoluminescence (TRPL, excitation wavelength of 375 nm) spectral characterization of perovskite films before and after passivation were carried out, and the results are shown in Figure a,b, respectively. Compared with the control films, the PL intensity of the passivated perovskite films is greatly increased, and the peak position shows a weak blue shift, indicating that the passivated CsPbI 2 Br films have higher crystal quality and lower density of trapped states . The double exponential decay function I = A e –( t – t 0 )/τ 1 + B e –( t – t 0 )/τ 2 and the formula τ ave = ( A 1 τ 1 2 + A 2 τ 2 2 )/( A 1 τ 1 + A 2 τ 2 ) were used to calculate the fitting carrier lifetime and average carrier lifetime τ ave . , The computational process is listed in Table S5.…”

“…Compared with the control films, the PL intensity of the passivated perovskite films is greatly increased, and the peak position shows a weak blue shift, indicating that the passivated CsPbI 2 Br films have higher crystal quality and lower density of trapped states. 56 The double exponential decay function I = Ae −(t−t 0 )/τ 1 + Be −(t−t 0 )/τ 2 and the formula…”

Inorganic CsPbI2Br halide perovskites: from fundamentals to solar cell optimizations

“…N 2 atmosphere and ambient air). 108 On the other hand, Duan et al showed that the addition of fullerene-ethylenediamine derivatives of C 60 -EDA in the SnO 2 precursor suppressed the oxygen vacancies of SnO 2 and decreased the hydrophobicity of the SnO 2 film surface, which allowed the CsPbI 2 Br precursor to spread more uniformly and induced highly crystalline CsPbI 2 Br films with larger perovskite grains and reduction of grain boundary defects. With C 60 -EDA, the energy level alignment between SnO 2 and CsPbI 2 Br was optimized, which helped to facilitate electron extraction/injection.…”