Random nitroxide radical conjugated polymer additives enable 19.32 % efficiency of organic solar cells
Artikel i vetenskaplig tidskrift, 2025

Minimizing non-radiative energy losses (Enon-radLoss) has been crucial to further boosting the efficiency of non-fullerene organic solar cells (NFAs-OSCs) to a new performance regime. Recently, we have developed an alternating radical conjugated polymer named GDTA from 3,4-dioctylthiophene flanked benzo[1,2-b;4,5-b’]dithiophene (BDT) and 1,4-bis(4-oxy-2,2,6,6-tetramethylpiperidine-1-oxyl)phthalate (BTMP), and demonstrated that GDTA can be used as additives to improve the performance of OSCs from a broad of photovoltaic materials system. Herein, the GDTA is accordingly optimized by varying the molar feed ratios of monomers containing BTMP and BDT moieties from 9:11, 2:3, 3:7 and 1:4, to generate the random radical conjugated polymers (R-RCPs) of R-GDTA90, R-GDTA80, R-GDTA60, R-GDTA40. For the NFAs-OSCs from PM6:Y6 blends, the addition of all the R-RCPs additives results in the general improvement of the efficiency of 9.3–11.5 % (16.12 % to 17.62 % ∼ 17.98 %). On contrary, the efficiencies of the devices from D18-Cl: L8-BO blends are firstly increased to 19.32 %, 19.02 % and finally dropped to 17.29 %, as the R-GDTA90, R-GDTA80, R-GDTA60 and R-GDTA40 are separately used as additives. The particularly interesting NFAs-OSCs, which present higher efficiency of 17.98 % and 19.32 % than those of 17.62 % and 18.78 % for devices with the counterpart GDTA additives, were achieved from PM6: Y6 and D18-Cl: L8-BO with the 2.0 wt% of R-GDTA80 and R-GDTA90 additives, respectively. Besides that, the more efficiently suppressed charge recombination and energy loss of the devices with the best-fitting R-RCPs in contrast to NFAs-OSCs with GDTA additives, were observed and supported by a range of physical measurements.

Organic solar cells

Random conjugated polymer

Non-radiative energy loss

Nitroxide radical

Författare

Pengzhi Guo

Lanzhou Jiaotong University

Yuyan Tao

Lanzhou Jiaotong University

Junhong Liang

Lanzhou Jiaotong University

Furong Shi

Lanzhou Jiaotong University

Xunchang Wang

Jianghan University

Zhengyu Zhu

Lanzhou Jiaotong University

Yongsheng Xiang

PetroChina Company Limited

Renqiang Yang

Jianghan University

Ergang Wang

Chalmers, Kemi och kemiteknik

Yangjun Xia

Lanzhou Jiaotong University

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 512 162339

Ämneskategorier (SSIF 2025)

Materialkemi

Polymerkemi

Annan kemi

DOI

10.1016/j.cej.2025.162339

Mer information

Senast uppdaterat

2025-04-23