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A Tandem Organic Solar Cell With PCE of 14.52% Employing Subcells With the Same Polymer Donor and Two Absorption Complementary Acceptors

A Tandem Organic Solar Cell With PCE of 14.52% Employing Subcells With the Same Polymer Donor and Two Absorption Complementary Acceptors

Lingxian Meng, Yuan-Qiu-Qiang Yi, Xiangjian Wan, Yamin Zhang, Xin Ke, Bin Kan, Yanbo Wang, Ruoxi Xia, Hin-Lap Yip, Chenxi Li, Yongsheng Chen

Adv Mater. 2019 May;31(18):e1804723.

PMID: 30907041

Abstract:

The tandem structure is an efficient way to simultaneously tackle absorption and thermalization losses of the single junction solar cells. In this work, a high-performance tandem organic solar cell (OSC) using two subcells with the same donor poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione))] (PBDB-T) and two acceptors, F-M and 2,9-bis(2-methylene-(3(1,1-dicyanomethylene)benz[f ]indanone))7,12-dihydro-(4,4,10,10-tetrakis(4-hexylphenyl)-5,11-diocthylthieno[3',2':4,5]cyclopenta[1,2-b]thieno[2″,3″:3',4']cyclopenta[1',2':4,5]thieno[2,3-f][1]benzothiophene (NNBDT), with complementary absorptions is demonstrated. The two subcells show high Voc with value of 0.99 V for the front cell and 0.86 V for the rear cell, which is the prerequisite for obtaining high Voc of their series-connected tandem device. Although there is much absorption overlap for the subcells, a decent Jsc of the tandem cell is still obtained owing to the complementary absorption of the two acceptors in a wide range. With systematic device optimizations, a best power conversion efficiency of 14.52% is achieved for the tandem device, with a high Voc of 1.82 V, a notable FF of 74.7%, and a decent Jsc of 10.68 mA cm-2 . This work demonstrates a promising strategy of fabricating high-efficiency tandem OSCs through elaborate selection of the active layer materials in each subcell and tradeoff of the Voc and Jsc of the tandem cells.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP32281360	Benzo[1,2-b:4,5-b']dithiophene-4,8-dione		32281-36-0	Price

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