Doped-carbazolocarbazoles as hole transporting materials in small molecule solar cells with different architectures

Abstract

The adaptation of interfacial layers to the stacked architecture of organic solar cells represents a very useful strategy for improved device operation. In this context, heteroacenic structures such as carbazolocarbazoles have been doped and evaluated as hole transporting materials in small molecule solar cell with either inverted or conventional architecture. S-kinks in the IV-curve detected for the inverted solar cells could be remarkably corrected by reversing the deposition sequence, highlighting the importance of buffer layer adjustment. Some of the studied carbazolocarbazoles proved to be a suitable molecule to be used as hole transporting materials.

Investigation of Structural and Optoelectronic Properties of Organic Semiconductor Film Based on 8-Hydroxyquinoline Zinc

“…In recent decades, several studies have been carried out on organic semiconductor devices and their feasible applications [1]. Due to their versatile properties and simple preparation method, organic semiconductors have been used in organic electronics, biological sensors, and renewable energy [1][2][3][4][5][6]. Organic semiconductors show slow mobility of carriers, although they present π delocalized links, a strong chemical interaction between the organic units integrating the semiconductors, and the possibility of generating the molecular blocks that constitute conduction channels [7][8][9].…”

“…Organic semiconductors show slow mobility of carriers, although they present π delocalized links, a strong chemical interaction between the organic units integrating the semiconductors, and the possibility of generating the molecular blocks that constitute conduction channels [7][8][9]. The combination of organic semiconductors defines the efficiency of organic devices, like organic solar cells (OSCs) or organic light-emitting diodes (OLEDs), and their performance can be improved by adding interfacial materials between the photoactive layer and the electrodes [5]. This plays a critical role in circumventing the shortcomings of the cathode transport layer (CTL).…”

Structure–Property Correlation behind the High Mobility of Carbazolocarbazole

“…Therefore, meticulous experimental research on the synthetic materials is still required. In the end, the combined studies from the theoretical and experimental side will provide more data that will permit the development of predicting methods and a better understanding of the structure–property correlation. , In this regard, we want to report the progress of our work in the series of carbazolocarbazoles whose hexacyclic structure results from the fusion of two carbazole units. − Particularly, we have studied in detail the effect of isomerism, as well as N-alkylation, on the crystal packing, thin film morphology, and charge transport properties of these materials. The impact of isomerism on solid state packing and subsequently on charge mobility has become an interesting aspect to look at as it can be inferred from recent studies. − In this regard, our investigation about the synthesis and processing of carbazolocarbazoles has allowed us to optimize materials and devices that have reached hole mobilities as high as 1.3 cm 2 V –1 s –1 in OFETs, which represent the highest mobility reported within the family of pyrrole-based azaphenacenes in thin film transistors. − We will focus our attention on the structures of carbazolo­[2,1- a ]­carbazole, 1 , carbazolo­[4,3- c ]­carbazole, 3 , and their corresponding N-alkylated derivatives, 2 and 4 (Figure ).…”

Fabrication and Study of Structural, Optical Features of Nano Structured, Photo-Harvesting Organo-Lead Halide-Based Perovskite Solar Cell

“…[15][16][17][18][19]. Consequently, DSSCs possessing organic hole transfer material (HTM) have drawn greater focus due to their stability [20] and comparable efficiency [21]. For hybrid perovskite solar cells, long-term stability may be attained in future works [22].…”