Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Abstract

As a superstars of photovoltaic devices, organic–inorganic hybrid perovskite solar cells (PSCs) have garnered plenty of interest due to their superior character. However, many defects, such as carrier recombination, inferior stability, poor interface contact, have prevented their further development. Here, we demonstrate a novel approach of interface engineering to form a compact perovskite layer with decreased defects on SnO2 film by adding tris­(pentafluorophenyl)­boron (TPFPB) as an interfacial modification layer, which validly improves the interface performance and enhances the crystallinity of MAPbI3. Hence the planar MAPbI3 PSCs with TPFPB modification show fast charge transfer and low trap state density with an enhanced champion power conversion efficiency (PCE) from the original of 16.92% to 19.41%, as well as long-term stability with 80.7% of its initial PCE after 1000 h of aging in N2 atmosphere without encapsulation, while the pristine one only shows 68.9% of the original PCE. The results reveal that TPFPB can be used as an effective interface modification layer for high efficiency and stability PSCs, and it maybe also be used in other devices due to its superior interface modification for high quality crystallinity thin films.

Marked Passivation Effect of Naphthalene‐1,8‐Dicarboximides in High‐Performance Perovskite Solar Cells

“…[ 62 ] Contrasting with that of the 9CN‐PMI‐modified and control device, the device with 4OH‐NMI showed higher R rec , implying a substantially suppressed charge recombination in the perovskite layer resulting from the reduced surface‐defect states. [ 32,63 ] Finally, the transient photovoltage decay shows that both 4OH‐NMI‐ and 9CN‐PMI‐modified PSCs possess a prolonged decay of 28 and 24 μs compared with the 19 μs of the control device (Figure S8, Supporting Information). The slower photovoltage decay also implied less recombination owing to the efficient trap passivation in the film.…”

Optimization of SnO2 electron transport layer for efficient planar perovskite solar cells with very low hysteresis

“…19,21,[28][29][30][31][32] Therefore, optimizing the electronic properties of the ETL/perovskite interface is one route for achieving hysteresis-free planar PSCs with highest PCEs. Many approaches have been proposed in this regard: (i) a bilayer ETL structure composed of two metal oxide films; [31][32][33][34][35] (ii) doping of the ETL; 5,18,19,36-40 (iii) an interfacial modification at the ETL/ perovskite interface; 30,32,[41][42][43][44][45][46][47][48][49][50][51][52] or (iv) doping the perovskite bulk. [53][54][55][56] Lithium (Li) has been introduced as promising dopant 5,36,[57][58][59][60][61] for improving the ETL/perovskite interface among others.…”

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

“…[280] Li et al reported the interfacial modification using tris(pentafluorophenyl)boron (TPFPB). [281] Subsequently, Tang et al designed hybrid ETL with SnO 2 and carbon nanotubes (CNTs), which effectively improved the conductivity of ETL and reduced the trap state density of SnO 2 films. To prepare the hybrid layer, they used a simple solution method to thermally decompose a mixed solution of SnCl 4 .5H 2 O and the pretreated CNTs.…”