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[DSSC, dye-sensitized solar cell, indoor photovoltaics, tandem, polymer electrolyte, co-sensitization]

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最終更新：2026-01-10

本ページは、3報のみを対象に、色素増感太陽電池（DSSC）の最新トピックを一般向けに解説します。

DSSC（色素増感太陽電池）とは？（やさしく）

DSSCは、色素が光を吸収して電子を出し、その電子が酸化物半導体（多くはTiO₂）へ移動して電気を生む太陽電池です。
特に、室内光（LED照明など）でも相性がよい設計が可能で、透明・色つき・デザイン性などの強みがあります。

ざっくり動作（5ステップ）

1. 色素が光を吸収して励起される
2. 電子がTiO₂側へ注入される
3. 電子が外部回路を流れて仕事をする
4. 電解質が色素を元に戻す（再生）
5. 対極で電解質が回収され、サイクルが回る

このファイルの3報で見える“研究の最前線”

• 室内光で25%超の高効率（タンデム・共増感）
• 固体/高分子電解質で、安定性と“扱いやすさ”を高める
• 新しい色素設計 + 共増感 + 助剤で、光の取り込みと電流を伸ばす

3本の論文を、一般向けに解説

1) 室内照明で25%超：タンデムDSSC（2025, Scientific Reports）

この研究は、ナフタレン骨格をもつ有機色素（BAM系列）を設計し、タンデム（2つのセルを組み合わせる）構成で性能を引き上げています。
– 太陽光条件（AM1.5G）で 12.13%、室内照明（25.85% (1000 lx)）で高効率
– 連続動作300時間後も 95% after 300 h を維持（安定性の目安）

なにが効いた？（やさしく）
– “光を吸う範囲”を広げる色素設計 + 複数色素の組み合わせ（共増感）
– 上側・下側で役割分担し、光を“取りこぼさない”タンデム設計

2) 1つの電解質で「発電」と「蓄電」へ：イオン液体入り高分子電解質（2026, JSAMD）

この研究は、ポリエチレンオキシド（PEO）系の高分子電解質に、リン系イオン液体を混ぜてイオンの動きやすさ（導電性）を改善しています。
– 室温での導電率：およそ 7.17 × 10^-4 S/cm（最適組成）
– 組成の例：20 wt% ionic liquid
– 特色：同じ電解質を DSSC + EDLC (supercapacitor) に使う“二刀流”の提案

なにが嬉しい？（やさしく）
– 液漏れしにくい方向（固体/準固体化）で、安全性・長期安定性に期待
– 発電デバイスと蓄電デバイスの材料共通化は、実装の発想として面白い

3) 光を取り込む工夫：トリアゾール架橋色素 + 共増感 + 助剤（2025, Journal of Saudi Chemical Society）

この研究は、新規の有機色素（MSA-1/2）を合成し、標準色素N719と共増感（co-sensitization）して性能を評価しています。
– 共増感で 7.65% (MSA-1 + N719) / 7.53% (MSA-2 + N719)
– さらに助剤（co-adsorbent）導入で 9.50% with HC-Acid / 8.96% with HC-Acid へ改善
– 例：短絡電流密度が 16.93 → 17.98 mA/cm² (MSA-1 + N719) のように増加

なにが効いた？（やさしく）
– 色素の“光の吸い方”を分子設計で最適化
– 助剤で、TiO₂表面の混み合い・逆反応（再結合）を抑えて、電流を取りやすくする

用語ミニ解説

• タンデムDSSC：2つのセルを積層/組み合わせ、吸収できる光の範囲を広げて効率を上げる考え方。
• 共増感（co-sensitization）：複数の色素を併用し、吸収スペクトルの穴を埋める方法。
• 電解質（electrolyte）：DSSC内部でイオンが動き、色素の再生などを担う材料。液体・ゲル・高分子などがある。

まとめ（1行）

DSSCは、室内光での高効率化、固体化による実装性、色素/界面設計による性能向上が同時に進んでいます。

参考文献（添付ファイル内の3報のみ）

1. Elmorsy, MR, Mohammed, SM, Mohamed, BA, Moustafa, AH, Badawy, SA (2025). High-efficiency tandem DSSCs based on tailored naphthalene sensitizers for indoor DSSC efficiency above 25%. SCIENTIFIC REPORTS. SCIENTIFIC REPORTS, 2025, 15(1), 44135. DOI: 10.1038/s41598-025-30854-0 (https://doi.org/10.1038/s41598-025-30854-0)
2. Rawat, S, Singh, RC, Michalska, M, Savilov, S, Diantoro, M, Singh, PK (2026). Multifunctional phosphonium-based ionic liquid embedded polymer electrolyte for dual energy conversion and storage. JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES. JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES, 2026, 11(1), 101084. DOI: 10.1016/j.jsamd.2025.101084 (https://doi.org/10.1016/j.jsamd.2025.101084)
3. Abu-Melha, S (2025). Enhanced light harvesting in dye-sensitized solar cells via Triazole π-bridged organic dyes: insights into co-sensitization and efficiency optimization. JOURNAL OF SAUDI CHEMICAL SOCIETY. JOURNAL OF SAUDI CHEMICAL SOCIETY, 2025, 29(6), 47. DOI: 10.1007/s44442-025-00048-4 (https://doi.org/10.1007/s44442-025-00048-4)

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English Version

DSSC Frontier (Dec 2025–Mar 2026): Indoor High Efficiency, Polymer Electrolytes, and Dye Engineering (3 Papers)

Last updated: 2026-01-10

This page is a public-friendly overview based only on the three papers included in the attached Web of Science export.

What is a DSSC (dye-sensitized solar cell)?

A DSSC generates electricity when a dye absorbs light and injects an electron into a semiconductor (often TiO₂). Because dye absorption can be engineered, DSSCs can be particularly attractive for ambient/indoor light and designable modules (color/partial transparency).

How it works (5 quick steps)

1. The dye absorbs light (excitation).
2. An electron is injected into TiO₂.
3. The electron flows through the external circuit.
4. The electrolyte regenerates the dye.
5. The counter electrode closes the ionic cycle.

What these three papers collectively show

• Very high indoor efficiency enabled by tandem + co-sensitization.
• Polymer/solid-like electrolytes aiming at stability and practical handling.
• New dye design + co-sensitization + surface additives to boost light harvesting and current.

Paper-by-paper highlights

1) >25% under indoor light: tandem DSSCs (2025, Scientific Reports)

Tailored organic dyes (BAM series) are combined in a tandem-like configuration to broaden harvesting and improve performance.
– Efficiency: 12.13% under AM1.5G; 25.85% (1000 lx) under indoor illumination
– Stability: 95% after 300 h after 300 h continuous operation (reported metric)

Why it matters: pairing dyes and splitting roles between top/bottom photoanodes can reduce “lost photons” and push indoor performance.

2) One electrolyte for energy conversion and storage: ionic‑liquid embedded polymer electrolyte (2026, JSAMD)

A phosphonium ionic liquid is incorporated into a PEO-based polymer electrolyte to enhance ionic transport and stability.
– Ionic conductivity (room temperature): ~7.17 × 10^-4 S/cm (optimized)
– Example composition: 20 wt% ionic liquid
– Demonstration: the same electrolyte works in DSSC + EDLC (supercapacitor)

Why it matters: polymer/solid-like electrolytes can mitigate leakage and improve robustness; cross-device material reuse is a practical design idea.

3) Better light harvesting via triazole π‑bridged dyes + co‑sensitization + co‑adsorbents (2025, JSCS)

Two triazole π‑bridged organic dyes (MSA‑1/2) are evaluated in co‑sensitization with benchmark N719, and further improved using a co‑adsorbent additive.
– Co‑sensitized PCE: 7.65% (MSA-1 + N719) / 7.53% (MSA-2 + N719)
– With co‑adsorbent: 9.50% with HC-Acid / 8.96% with HC-Acid
– Example current gain: 16.93 → 17.98 mA/cm² (MSA-1 + N719)

Why it matters: combining molecular design and surface/interface control can translate into higher current and overall efficiency.

Mini glossary

• Tandem DSSC: combining two sub-cells to harvest a wider spectral range.
• Co-sensitization: using multiple dyes to fill spectral gaps.
• Electrolyte: ionic medium that regenerates the dye and transports charge internally (liquid/gel/polymer).

References (only the 3 papers in the attached file)

1. Elmorsy, MR, Mohammed, SM, Mohamed, BA, Moustafa, AH, Badawy, SA (2025). High-efficiency tandem DSSCs based on tailored naphthalene sensitizers for indoor DSSC efficiency above 25%. SCIENTIFIC REPORTS. SCIENTIFIC REPORTS, 2025, 15(1), 44135. DOI: 10.1038/s41598-025-30854-0 (https://doi.org/10.1038/s41598-025-30854-0)
2. Rawat, S, Singh, RC, Michalska, M, Savilov, S, Diantoro, M, Singh, PK (2026). Multifunctional phosphonium-based ionic liquid embedded polymer electrolyte for dual energy conversion and storage. JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES. JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES, 2026, 11(1), 101084. DOI: 10.1016/j.jsamd.2025.101084 (https://doi.org/10.1016/j.jsamd.2025.101084)
3. Abu-Melha, S (2025). Enhanced light harvesting in dye-sensitized solar cells via Triazole π-bridged organic dyes: insights into co-sensitization and efficiency optimization. JOURNAL OF SAUDI CHEMICAL SOCIETY. JOURNAL OF SAUDI CHEMICAL SOCIETY, 2025, 29(6), 47. DOI: 10.1007/s44442-025-00048-4 (https://doi.org/10.1007/s44442-025-00048-4)