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A low‐cost, chlorinated hydrocarbon solvent, 1,1,2,2‐tetrachloroethane (TeCA), is used as an effective additive for the triarylamine‐based organic hole‐transport material, Spiro‐OMeTAD, which is successfully applied in highly efficient solid‐state dye‐sensitized solar cells. A record power conversion efficiency of 7.7% is obtained by using the donor (D)‐π‐acceptor (A)‐dye, LEG4, in combination with the new method of TeCA‐doping of the hole‐transporting material Spiro‐OMeTAD. [ABSTRACT FROM AUTHOR]

The phenoxazine‐based acceptor–donor–acceptor structured small‐molecule material M1 is used either as a hole‐transport material in (CH3NH3)PbI3‐perovskite‐based solar cells or as photoactive donor material in bulk heterojunction organic solar cells. Excellent power conversion efficiencies of 13.2% and 6.9% are achieved in these two types of photovoltaic devices, respectively. [ABSTRACT FROM AUTHOR]

Carbazole is a promising core for the molecular design of hole‐transport materials (HTMs) for solid‐state mesoscopic solar cells (ssMSCs), such as solid‐state dye‐sensitized solar cells (ssDSSCs) and perovskite solar cells (PSCs) due to its low cost and excellent optoelectronic properties of its derivatives. Although carbazole‐based HTMs are intensely investigated in ssMSCs and promising device performance is demonstrated, the fundamental understanding of the impact of linking topology on the properties of carbazole‐based HTMs is lacking. Herein, the effect of the linking topology on the optical and electronic properties of a series of carbazole‐based HTMs with 2,7‐substitution and 3,6‐substitution is systematically investigated. The results demonstrate that the 2,7‐substituted carbazole‐based HTMs display higher hole mobility and conductivity among this series of analogous molecules, thereby exhibiting better device performance. In addition, the conductivity of the HTMs is improved after light treatment, which explains the commonly observed light‐soaking phenomenon of ssMSCs in general. All these carbazole‐based HTMs are successfully applied in ssMSCs and one of the HTMs X50‐based devices yield a promising efficiency of 6.8% and 19.2% in ssDSSCs and PSCs, respectively. This study provides guidance for the molecular design of effective carbazole‐based HTMs for high‐performance ssMSCs and related electronic devices. [ABSTRACT FROM AUTHOR]

In article number 1402340, Licheng Sun and co‐workers report the use of a lowcost organic solvent, 1,1,2,2‐tetrachloroethane (TeCA), as an additive for the well‐known p‐type organic hole transport material‐2,2',7,7'‐tetrakis‐(N,N‐di‐pmethoxyphenyl‐amine)‐9,9'spiro‐bifluorene (Spiro‐OMeTAD). It is found that this significantly increases the conductivity of Spiro‐OMeTAD‐based semiconducting films. Subsequently, this additive is successfully applied in Spiro‐OMeTAD‐based solid‐state dye‐sensitized solar cells, and a record power conversion efficiency of 7.7% is obtained under one sun illumination. [ABSTRACT FROM AUTHOR]

Two low-cost, easily synthesized π-conjugated molecules have been applied as hole-transport materials (HTMs) for solid state dye-sensitized solar cells (ssDSSCs) and perovskite solar cells (PSCs). For X1-based devices, high power conversion efficiencies (PCEs) of 5.8% and 14.4% in ssDSSCs and PSCs has been demonstrated. For X14-based devices, PCEs were improved to 6.1% and 16.4% in ssDSCs and PSCs, respectively. [ABSTRACT FROM AUTHOR]