Efficient Tandem Organic Photovoltaics with Tunable Rear Sub-cells

Cheng, Pei; Liu, Yuqiang; Chang, Sheng -Yung; Li, Tengfei; Sun, Pengyu; Wang, Rui; Cheng, Hao -Wen; Huang, Tianyi; Meng, Lei; Nuryyeva, Selbi; Zhu, Chenhui; Wei, Kung -Hwa; Sun, Baoquan; Zhan, Xiaowei; Yang, Yang

doi:10.1016/j.joule.2018.11.011

Title: Efficient Tandem Organic Photovoltaics with Tunable Rear Sub-cells

Journal Article · 04 December 2018 · Joule

DOI: https://doi.org/10.1016/j.joule.2018.11.011 · OSTI ID:1580370

Cheng, Pei ^[1]; Liu, Yuqiang ^[2]; Chang, Sheng -Yung ^[1]; Li, Tengfei ^[3]; Sun, Pengyu ^[1]; Wang, Rui ^[1]; Cheng, Hao -Wen ^[4]; Huang, Tianyi ^[1]; Meng, Lei ^[1]; Nuryyeva, Selbi ^[1]; Zhu, Chenhui ^[5]; Wei, Kung -Hwa ^[6]; Sun, Baoquan ^[7]; Zhan, Xiaowei ^[3]; Yang, Yang ^[1]

Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States); Soochow Univ., Suzhou (China)
Peking Univ., Beijing (China)
Univ. of California, Los Angeles, CA (United States); National Chiao Tung Univ., Hsinchu (Taiwan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National Chiao Tung Univ., Hsinchu (Taiwan)
Soochow Univ., Suzhou (China)

A tandem structure was invented to enhance photon utilization efficiency and reduce thermal loss. Considering the unique advantages of non-fullerene acceptors (NFAs), the combination of NFAs and the tandem concept shows great potential for organic photovoltaics (OPVs). Herein, a simple strategy to balance the voltage-current trade-off in tandem OPVs by employing mixed NFAs in rear sub-cells is reported. The V_OC and J_SC of rear sub-cells can be tuned by using the blend of donor/NFA/NFA. Furthermore, this strategy offers an easy approach to balance the V_OC and J_SC in tandem OPVs toward higher power conversion efficiency (PCE) without rational and careful synthesis of new materials. Tandem OPVs based on mixed NFAs in rear sub-cells exhibited the best PCE of 13.3% in the lab. Importantly, the tandem devices were certified by the National Renewable Energy Laboratory (NREL) under asymptotic scans, and a PCE of 11.52% was achieved and recognized on the most recent NREL chart.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1580370

Journal Information:: Joule, Journal Name: Joule Journal Issue: 2 Vol. 3; ISSN 2542-4351

Publisher:: Elsevier - Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Efficient Tandem Organic Photovoltaics with Tunable Rear Sub-cells

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