DataVXACS Energy LettersPaper
journal article·2018-01-12

Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells

Seon Joo Lee, Seong Sik Shin, Jino Im, Tae Kyu Ahn, Jun Hong Noh, Nam Joong Jeon, Sang Il Seok, Jangwon Seo

ACS Energy Letters· Volume 3· Issue 1
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Source abstract

Abstract

In Sn-based halide perovskite solar cells (PSCs), the oxidation of Sn2+ to Sn4+ under ambient air leads to unwanted p-type doping in the perovskite film, which is a main reason for increased background carrier density and low efficiency. Here, we find that the introduction of bromide into formamidinium tin iodide (CH(NH2)2SnI3, FASnI3) lattice significantly lowers the carrier density of perovskite absorber, which is thought to be a result of reduction of Sn vacancies. It reduces the leakage current of devices, increases recombination lifetime, and finally improves open-circuit voltage and fill factor of the resulting devices employing mesoporous TiO2 as an electron transport layer. Consequently, a high power conversion efficiency (PCE) of 5.5% is achieved with an average PCE of 5%, and after encapsulation the devices are highly stable over 1000 h under continuous one sun illumination including the ultraviolet region. This study suggests a simple approach for improving stability and efficiency in FASnI3-based PSCs.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea

Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangsan-gu, Suwon 440-746, Republic of Korea

School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea

School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea

Funding

Korea Research Institute of Chemical Technology · Sungkyunkwan University · National Research Foundation of Korea · Ministry of Trade, Industry and Energy · Korea Institute of Energy Technology Evaluation and Planning

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