Origin of Photovoltaics in Organic Solar Cells at Negligible Energy Level Offsets-An Insight of the Charge Accumulation Effect

Wang，Jianqiao1; Han，Liang2; He，Feng2; Ma，Yuguang1,3

2022-11-10

10.1021/acs.jpclett.2c02742

Journal of Physical Chemistry Letters   Impact Factor & Quartile

1948-7185

1948-7185

Reducing the energy level offset is one of the key elements of low open-circuit voltage loss in organic solar cells. However, the origin of charge separation driving force at negligible energy level offsets still remains unexplained. Herein, from the perspective of built-in potential caused by charge accumulation, we discuss the nonequilibrium energy level displacement as current passing with distinct variable current densities. Due to the different carrier mobilities of electrons and holes in organic semiconductor materials, carriers with high mobility will be rapidly transmitted to the electrode, while those with low mobility will remain in the materials, resulting in the accumulation of corresponding charges. It is suggested that the higher the carrier mobility, the better the efficiency of photovoltaic devices, with the balance of the charge transport.

SCI

English

NI Journal Papers

Corresponding

[21733005] ; [91833304] ; [2020B121201002]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000884808600001

AMER CHEMICAL SOC

2-s2.0-85141582601

Scopus

1.State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology,Guangzhou,No. 381 Wushan Road, Tianhe Distinct,510640,China
2.Shenzhen Grubbs Institute,Guangdong Provincial Key Laboratory of Catalysis,Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou,No. 381 Wushan Road, Tianhe Distinct,510640,China

Wang，Jianqiao,Han，Liang,He，Feng,et al. Origin of Photovoltaics in Organic Solar Cells at Negligible Energy Level Offsets-An Insight of the Charge Accumulation Effect[J]. Journal of Physical Chemistry Letters,2022,13(44):10404-10408.

Wang，Jianqiao,Han，Liang,He，Feng,&Ma，Yuguang.(2022).Origin of Photovoltaics in Organic Solar Cells at Negligible Energy Level Offsets-An Insight of the Charge Accumulation Effect.Journal of Physical Chemistry Letters,13(44),10404-10408.

Wang，Jianqiao,et al."Origin of Photovoltaics in Organic Solar Cells at Negligible Energy Level Offsets-An Insight of the Charge Accumulation Effect".Journal of Physical Chemistry Letters 13.44(2022):10404-10408.