Highly Efficient and Stable Perovskite Solar Cells Enabled by All-Crosslinked Charge-Transporting Layers

Abstract

We have designed and synthesized a crosslinkable n-type conjugated molecule, c-HATNA. This c-HATNA electron-transporting layer can be used in conjunction with another crosslinkable hole-transporting layer, c-TCTA-BVP (recently reported by our group), to fabricate an all-crosslinked CTL for PVSC. Benefiting from the lowtemperature crosslinking reactions, the derived cells can achieve high PCE of 16.08% and 13.42% on rigid and flexible substrates, respectively. The device with all-crosslinked CTLs showed impressive thermal stability in ambient environment without encapsulation.

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells

“…The low PCE might come from the low electron mobility of c‐HATNA (6.92 × 10 −5 cm 2 V −1 s −1 ). After the addition of 3% Et 3 N, the mobility was enhanced to 1.14 × 10 −3 cm 2 V −1 s −1 , leading to the enhancement in PCE (18.2%) …”

“…a) Structure of c‐HATNA, b) contact angle of PCBM and HATNA, and c) photograph of PCBM‐based device (left) and c‐HATNA‐based device (right) after exposure to water. Reproduced with permission . Copyright 2018, Elsevier.…”

Low-temperature, simple and efficient preparation of perovskite solar cells using Lewis bases urea and thiourea as additives: stimulating large grain growth and providing a PCE up to 18.8%

“…[12][13][14] The incorporation of additive has been recognized as an efficient methodology to increase the performance of PSCs. [15][16][17][18] Previous reports have demonstrated that incorporating diiodooctane (DIO), NH 4 Cl 19,20 and alkylammonium iodides 11,21 can increase the performance of PSC devices. Furthermore, the inserting of bulky cations can induce formation of 2D perovskites, which has been shown to improve the stability of PSCs.…”

Efficient Bifacial Passivation with Crosslinked Thioctic Acid for High‐Performance Methylammonium Lead Iodide Perovskite Solar Cells

“…[18] Meanwhile, these trap states create conditions for the infiltration of moisture and oxygen into perovskite layer and subsequently seriously decrease the device stability. Additive engineering [26][27][28][29][30][31][32][33][34] and interface engineering [35][36][37][38][39][40][41] have been regarded as effective strategies to reduce the defect density in PSCs, such as incorporating Phenyl-C61-butyric acid methyl ester (PCBM) [29] into perovskite layer to effectively passivate the defects and minimize the photocurrent hysteresis, inserting self-assembled monolayer of organic molecules with functional groups [36,37] into perovskite/ETL interface to suppress defects Defects, inevitably produced within bulk and at perovskite-transport layer interfaces (PTLIs), are detrimental to power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). [23][24][25] Therefore, it is imperative to seek an effective way to reduce the defects, especially at the PTLIs, for achieving the high-performance PSCs.…”