A Tandem Organic Solar Cell with PCE of 14.52% Employing Subcells with the Same Polymer Donor and Two Absorption Complementary Acceptors
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 1804723 |
Journal / Publication | Advanced Materials |
Volume | 31 |
Issue number | 18 |
Publication status | Published - 3 May 2019 |
Externally published | Yes |
Link(s)
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 V oc 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 V oc of their series-connected tandem device. Although there is much absorption overlap for the subcells, a decent J sc 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 V oc of 1.82 V, a notable FF of 74.7%, and a decent J sc 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 V oc and J sc of the tandem cells.
Research Area(s)
- nonfullerene acceptors, organic solar cells, tandem devices
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Citation Format(s)
A Tandem Organic Solar Cell with PCE of 14.52% Employing Subcells with the Same Polymer Donor and Two Absorption Complementary Acceptors. / Meng, Lingxian; Yi, Yuan-Qiu-Qiang; Wan, Xiangjian et al.
In: Advanced Materials, Vol. 31, No. 18, 1804723, 03.05.2019.
In: Advanced Materials, Vol. 31, No. 18, 1804723, 03.05.2019.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review