Highly efficient bulk heterojunction photovoltaic cells based on C70 and tetraphenyldibenzoperiflanthene

Abstract

Highly efficient photovoltaic cells based on a bulk heterojunction configuration composed of C70 with various donor materials at 5 wt. % donor concentration were fabricated. The tetraphenyldibenzoperiflanthene (DBP) donor achieved the highest power conversion efficiency (ηPCE) of 6.4% for the optimized cell. The improved performance with DBP arises from a combination of a higher absorption coefficient than 1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane and a symmetrical molecular structure. The high ηPCE with only 5 wt. % donor is attributed to a sufficient donor concentration for enhanced Frenkel exciton dissociation in C70, while efficiency and electron mobility decrease at higher donor concentrations.

Power conversion efficiency enhancement of polymer solar cells using MoO3/TFB as hole transport layer

“…Polymer solar cells (PSCs) are promising candidates for the future low-cost and relatively low-temperature solar energy conversion [1][2][3]. Power conversion efficiency (PCE) has increased rapidly by using the new acceptor and donor photovoltaic materials and novel device structures [4,5].…”

Thiophene dendrimer-based low donor content solar cells

“…However, elucidation of the exact mechanism is complex and will require further study. 24 The use of MoOx instead of PEDOT:PSS, as an anode interlayer, has been shown to yield an increase in efficiency for low donor content devices, 3,6,7,11,25 and hence in the final aspect of this study, we prepared devices of the following structure: ITO/MoOx/42T:PCBM/Ca/Al (with the BHJ formed from a 13 mol. % casting solution), with and without methanol vapor annealing.…”

Temperature dependence of the electrical properties of organic thin-film transistors based on tetraphenyldibenzoperiflanthene deposited at different substrate temperatures: Experiment and modeling

“…More recently, organic thin-film transistor based DBP (DBP-OTFTs) was fabricated in order to characterize the DBP the DBP thin-films [17]. In order to improve the performance of the OTFTs, several studies have focused on the effects induced by intrinsic factors such as humidity, illumination and temperature [16][17][18][19][20][21][22][23][24], as well as the nature of the dielectric layer and source-drain electrodes [25][26]. In order to understand the transport phenomena in the OTFTs, the behavior of the carrier mobility as function various gate voltages/carrier density and temperature has been widely studied [27][28][29][30].…”

“…On the other hand, a numerous collection of donor organic materials have been developed and studied in the previous decade. In particular, tetraphenyldibenzoperiflanthene (DBP) has appeared as a promising electron-donor material for photovoltaic applications [17][18][19][20]. More recently, organic thin-film transistor based DBP (DBP-OTFTs) was fabricated in order to characterize the DBP the DBP thin-films [17].…”