Novel hole transporting materials with a linear π-conjugated structure for highly efficient perovskite solar cells

Abstract

Novel small-molecule hole transporting materials (HTMs) with a linear π-conjugated structure have been synthesized. The perovskite solar cell based on as the HTM exhibits an encouraging power conversion efficiency of 9.1% under AM 1.5 G (100 mW cm(-2)) illumination, which is the first demonstration of an effective perovskite solar cell using a linear structured HTM.

Benzotrithiophene‐Based Hole‐Transporting Materials for 18.2 % Perovskite Solar Cells

“…These interface layers play an important role for transporting and blocking the charges. A wide number of HTMs have been synthesized and investigated in combination with perovskite absorber ranging from classical semiconducting polymers to small molecules.Focusing on the latter, different central cores have been used in the state-of-the-art photovoltaic devices, such as 9,9'-spirobifluorene, [14] spiro-liked derivatives, [15] thiophene derivatives, [16] triphenylamine, [17] bridged-triphenylamines, [18,19] pyrene, [20] 3,4-ethylenedioxythiophene, [21] linear p-conjugated, [22][23][24] triptycene, [25] tetraphenylethene, [26] silolothiophene or triazines, [27] all of them namely decorated with diarylamines, triarylamines and/or carbazole derivatives. With this approach, the best power conversion efficiency obtained to date, up to 20 %, [13] has been achieved by using the polymer poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA).…”

Dopant‐Free Donor (D)–π–D–π–D Conjugated Hole‐Transport Materials for Efficient and Stable Perovskite Solar Cells

“…Due to its relatively low hole mobility and its tedious synthesis strongly correlated to its production cost, numerous alternative HTMs have been explored with an aim to replace such a material [9][10][11][12][13][14][15][16][17][18][19][20] . Although inorganic HTMs (CuI and CuSCN) have drawn much attention due to their high hole mobilities and low production cost [21] ,polymeric HTMs, such as conjugated polytriarylamine (PTAA) [22] , poly(3-hexylthiophene-2,5-diyl) (P3HT) [23] etc., have also shown competitive performances in PSCs, small molecular HTMs have advantages of their convenient purification, controllable molecular structures and relatively high efficiency [24] .Regarding small molecule HTMs incorporated with dopants, the PCE of the dopant-free HTM based devices are consistently lying between 10% to 13% [25][26][27][28][29][30][31][32][33][34][35][36] , few are over 15%. [37][38][39][40] Herein, we report the synthesis and characterization of three novel dopant-free 4-Methoxytriphenylamine (MeOTPA) -based HTMs as shown in Figure 1a, Figure 1b and experimental details are given in the Experimental Section.…”

Recent Advances in Perovskite-Based Solar Cells

“…In addition, spiroOMeTAD enhanced PCE only after being doped with a metal complex and/or additives, which might affect the stability of the device. In order to resolve these issues, several groups are working on alternatives for spiroOMeTAD and have developed low-cost and efficient HTMs, particularly inorganic and small organic molecules [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] . In this context, inorganic semiconductors are found to be the best alternative in PSC because of high hole mobility, synthesis feasibility and low production cost.…”